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N. Saif1,2, H. Hristov1, K. Akiyoshi1, K. Niotis1, I.E. Ariza1, N. Malviya3, P. Lee1, J. Melendez4, G. Sadek5, K. Hackett6, A. Rahman1, J. Meléndez-Cabrero7, C.E. Greer8, L. Mosconi1, R. Krikorian9, R.S. Isaacson1,10


1. Department of Neurology, Weill Cornell Medicine and NewYork-Presbyterian, New York, NY, USA; 2. SUNY Upstate College of Medicine, Syracuse, NY, USA;
3. Albert Einstein College of Medicine, Bronx, NY, USA; 4. Jersey Memory Assessment Service, Health and Community Services, Jersey, United Kingdom; 5. Department of Neurology, Case Western Reserve University & University Hospitals, Cleveland Medical Center, Cleveland, OH, USA; 6. Department of Psychology, Temple University, Philadelphia, PA, USA; 7. Alzheimer’s Prevention Clinic and Research Center to Puerto Rico, San Juan, Puerto Rico, USA; 8. Department of Ophthalmology, Weill Cornell Medicine, New York, NY, USA; 9. Department of Psychiatry & Behavioral Neuroscience, University of Cincinnati College of Medicine, Cincinnati, OH, USA; 10. Center for Brain Health, Alzheimer’s Prevention Clinic, Florida Atlantic University, Boca Raton, FL, USA

Corresponding Author: Richard S. Isaacson, MD, Department of Neurology, Weill Cornell Medicine and NewYork-Presbyterian, 428 E 72nd Street, Suite 400, New York, NY, 10021, USA, Phone: 212-746-4624 Fax: 646-962-0236 Email:

J Prev Alz Dis 2022;4(9):731-742
Published online April 26, 2022,



Background: The Comparative Effectiveness Dementia & Alzheimer’s Registry (CEDAR) trial demonstrated that individualized, multi-domain interventions improved cognition and reduced the risk of Alzheimer’s disease (AD). As biological sex is a significant risk factor for AD, it is essential to explore the differential effectiveness of targeted clinical interventions in women vs. men.
Methods: Patients were recruited from an Alzheimer’s Prevention Clinic. Subjects with normal cognition, subjective cognitive decline, or asymptomatic preclinical AD were classified as “Prevention”. Subjects with mild cognitive impairment due to AD or mild AD were classified as “Early Treatment.” The primary outcome was the change from baseline to 18-months on the modified-Alzheimer’s Prevention Cognitive Composite. Secondary outcomes included a cognitive aging composite, AD and cardiovascular (CV) risk scales, and serum biomarkers. Subjects who adhered to >60% of recommendations in the CEDAR trial were included in this a priori sub-group analysis to examine whether individualized intervention effects were modified by sex (n=80).
Results: In the Prevention group, both women (p=0.0205) and men (p=0.0044) demonstrated improvements in cognition with no sex differences (p=0.5244). In the Early Treatment group, there were also no significant sex differences in cognition (p=0.3299). In the Prevention group, women demonstrated greater improvements in the Multi-Ethnic Study of Atherosclerosis risk score (MESA-RS) than men (difference=1.5, p=0.0013). Women in the Early Treatment group demonstrated greater improvements in CV Risk Factors, Aging and Incidence of Dementia (CAIDE) risk score (difference=2.3, p=0.0067), and the MESA-RS (difference=4.1, p<0.001).
Conclusions: Individualized multi-domain interventions are equally effective at improving cognition in women and men. However, personally-tailored interventions led to greater improvements in calculated AD and CV risk, and CV blood biomarkers, in women compared to men. Future study in larger cohorts is necessary to further define sex differences in AD risk reduction in clinical practice.

Key words: Alzheimer’s Prevention Clinic, Alzheimer’s disease; precision medicine, sex-driven differences.



Alzheimer’s disease (AD) develops over an extended preclinical period, with amyloid plaques, neurofibrillary tangles, and glucose hypo-metabolism occurring at least 15-20 years before the onset of symptoms (1-4). Considering the limited progress with developing effective, disease-modifying therapeutics to treat AD, along with the fact that an estimated 46 million Americans have preclinical AD, clinical and research efforts have begun to focus on delaying, or possibly preventing, progression to dementia (5).
Research has continued to identify modifiable risk factors throughout the lifespan for AD, such as hypertension, diabetes, and cardiovascular (CV) disease, among others (6-8). Population-attributable risk models have suggested that managing such risk factors can prevent up to one-third of dementia cases, highlighting the immense potential that lies in addressing modifiable risk factors. Several large-scale, randomized controlled trials (RCTs) have shown that multi-domain lifestyle-based interventions, including nutrition, exercise, and cognitive training, can ameliorate vascular and lifestyle-related risk factors, maintain cognitive function, and reduce the risk of dementia (9-12). In an effort to translate these findings into clinical practice, the Comparative Effectiveness Dementia & Alzheimer’s Registry (CEDAR) study showed that individualized clinical management using multi-domain interventions geared for AD risk reduction was feasible in an outpatient clinic setting. Significant improvements in cognition were found from baseline to 18-months when compared with two matched historical control cohorts (National Alzheimer’s Coordinating Center; Rush Memory and Aging Project). Reductions in calculated AD and CV risk scores, and improvements in serum AD risk biomarkers were also found (13).
While it is encouraging that multi-domain interventions may reduce modifiable AD risk, the effectiveness of these approaches has not yet been robustly investigated with consideration for sex. Research has suggested that after increasing age, the most significant risk factor for AD dementia is female sex—two-thirds of AD patients are females (14, 15). Statistical models have indicated that even when accounting for gender-dependent mortality rates, age at death, and differences in lifespan, women still have twice the risk of incidence (16, 17). Furthermore, a growing body of evidence suggests there are stark differences in brain anatomy, function, and age-related morphological changes between men and women (17). Women have been shown to accumulate greater neurofibrillary tangle burden than men when compared at the same amyloid burden level, suggesting an earlier onset of AD (18). One theory posits that estrogen is neuroprotective against AD. As women age, their estrogen levels sharply decline, contributing to the development and progression of AD (19). In men, age-related decline in testosterone levels is associated with increased risk for AD (19). However, men lose testosterone at a significantly slower rate than women lose estrogen (19). Additionally, women traditionally had fewer opportunities for educational attainment and thus have weaker cognitive reserves when compared to men (20).
To our knowledge, the CEDAR study was among the first clinical research trials to evaluate the effectiveness of evidence-based individually-tailored, multi-domain interventions on cognition, AD/CV risk scores, and AD risk biomarkers in real-world clinical practice.
In this sub-analysis, we sought to examine if sex significantly affects the cognitive, CV, and AD risk outcomes in subjects who follow individually-tailored, multi-domain interventions.



Study Design and Participants

The CEDAR study procedures, baseline population characteristics, and primary results have been previously described in detail (13, 21). In the original study, participants were separated into two groups based on compliance to recommendations: participants who followed >60% of the recommendations were classified as “higher-compliance,” whereas participants who followed ≤60% were classified as “lower-compliance.” In this sub-group analysis, we evaluated the differential effectiveness of the clinical approach itself when considering sex in higher-compliance participants (n=80) from the original study cohort (n=154). Within this cohort, similar to the original study, participants were grouped based on baseline diagnoses: normal cognition, subjective cognitive decline, and preclinical AD participants were classified as “Prevention.” Mild cognitive impairment (MCI) due to AD and mild AD were classified as “Early Treatment.”
All participants were recruited at the Alzheimer’s Prevention Clinic at Weill Cornell Medicine & New-York Presbyterian. Inclusion criteria assessed via an initial telephone screen included a family history of AD and no or minimal cognitive complaints. Exclusion criteria assessed during an in-person evaluation included a diagnosis of moderate-to-severe AD dementia or other dementia; disorders affecting safe engagement in interventions (e.g., malignant disease, major depression, psychotic disorder); or coincident participation in another trial. Participants with a clinical diagnosis of MCI or early mild dementia with negative amyloid neuroimaging were also excluded.
Institutional Review Board approval was obtained on February 16th, 2015, and patients were consented to participate in the Comparative Effectiveness Dementia & Alzheimer’s Registry (Protocol #1408015423). Trial registered at (NCT03687710).


This methodology was outlined in detail in prior publication. In brief, after undergoing baseline clinical assessments, which included a detailed clinical history, physical examination, anthropometrics, blood biomarkers, apolipoprotein-ε4 (APOE-e4) genotyping, and cognitive assessment, patients were given individually-tailored, multi-domain intervention recommendations informed by these clinical and biomarker data. Recommendation categories included patient education/genetic counseling, individualized pharmacological approaches (medications/vitamins/supplements), non-pharmacological approaches (exercise counseling, dietary counseling, vascular risk reduction, sleep hygiene, cognitive engagement, stress reduction, general medical care), and other evidence-based interventions (13, 21). Table 1 outlines which interventions were recommended based on the presence of specific risk factors, as well as differences in various interventions with regards to sex. Additionally, Appendix B in the supplementary material outlines a more detailed application of Table I and our previously published clinical approach (21). It is important to note that these interventions are evidence-based and their clinical application requires a comprehensive evaluation from a qualified healthcare provider. Furthermore, it is necessary for providers to stay current on new research in this field, as evidence continues to emerge on the effectiveness of different interventions across several risk categories, including stress management (e.g., kirtan kriya) (22, 23), nutrition (24), and exercise (25).
Each participant was seen for longitudinal follow-up visits every 6-months, during which continual refinement of interventions would occur. Upon follow-up, each participant was graded as “compliant” or “not compliant” with each recommendation. Afterward, a composite compliance score was calculated as a percentage of recommendations adhered to on a scale of 1–10 (1 represents 0–10% of recommendations, etc.), assessed independently by two clinicians based on patient discussion and patient Likert-scale ratings. Clinicians then collectively assigned an overall compliance score prior to reviewing any follow-up data. Higher-compliance participants were pre-specified as following >60% of all recommendations given, versus lower-compliance participants (≤60%).

Table 1. Example Personalized Interventions



The primary outcome was the change in performance on the modified-Alzheimer’s Prevention Initiative Cognitive Composite (m-APCC) from baseline to 18-months. Statistical comparisons were performed between women and men within higher-compliance groups within each diagnostic classification (13, 26).
Secondary outcomes included changes on a composite of neuropsychological tests associated with non-pathological cognitive aging (CogAging), two AD risk scales (Australian National University–AD Risk Index (ANU-ADRI), Cardiovascular Risk Factors, Aging and Incidence of Dementia (CAIDE), two CV risk scores (American College of Cardiology/American Heart Association (ACC/AHA), Multi-Ethnic Study of Atherosclerosis (MESA), and AD risk biomarkers (27-30). Exploratory outcomes were chosen a priori based on evidence supporting their use in assessment of AD and/or cardiovascular disease risk. Additionally, when indicated, these measures were used to inform clinical management decisions that target modifiable AD/CVD risk factors. Exploratory outcomes included change in three risk scales, the Mayo Clinic Mild Cognitive Impairment Risk Score (Mayo MCI-RS), Mid-Life Disease Risk Score, and Vascular Risk for Late-Onset Alzheimer’s Disease Risk Score (Vascular Risk for LOAD RS) (31-33).
All outcomes are shown in Table 2.

Table 2. Outcomes


Statistical Methods


Participants were grouped based on biological sex and clinical diagnosis. Two-sided P-values were used for all comparisons, with no correction for multiplicity due to the a priori intent to investigate the primary outcome across Diagnosis×Sex groups. All secondary and exploratory analyses may be considered hypothesis-generating and not confirmatory.

Mixed Model Repeated Measures (MMRM)

Change from baseline in all outcomes was analyzed at 18 months for the Full Analysis Set (FAS) using MMRM that included all available data for all participants with at least one follow-up visit. Least squares mean (LSMEAN) estimates at each visit were reported and groups were compared with least squares differences (LSDIFFs). The primary model included diagnostic classification (Prevention/Early Treatment) and sex (male/female) with Diagnosis×Sex interaction, as well as age, baseline score, baseline Mini-Mental State Examination, and visit. The interaction between quantitative compliance and diagnosis group was used to assess whether limiting the analysis to higher-compliance affected the sex sub-groups differently. SAS® V9.4 PROC MIXED was used.

Compliance Adjusted Model

Since participant characteristics may affect compliance levels, predictors of compliance were assessed by fitting a stepwise regression model. To assess the specific impact of compliance, significant baseline predictors of compliance (at α<.05) were identified and corrected for as covariates in the adjusted MMRM, which also included a term for Baseline×Time interaction. LSMEANs estimates from the Diagnosis×Sex interaction using the adjusted model are shown for the primary analysis.


Baseline Demographics

Baseline characteristics are described in Table 3. The mean age of all participants was 60.4 (SD 12.4) years old, with no differences between men and women in the Prevention group (p=0.605) and in the Early Treatment group (p=0.804). There were differences found in body mass index (BMI) between women and men in both the Prevention (p=0.002) and Early Treatment (p=0.004) groups.

Table 3. Patient Demographics and Baseline Characteristics


Predictors of Compliance

The baseline compliance model identified three baseline parameters that significantly predicted compliance: baseline HbA1c (p<.0001), baseline ACC/AHA risk score (p<.0001), and baseline homocysteine (p=.0225). These parameters were included as co-variates in the Compliance Adjusted Model. The interactive analysis for quantitative compliance and sex resulted in a statistically insignificant interaction (p=0.4518). Each extra point of compliance (complying with an additional 10% of recommendations) resulted in 0.09 point improvement in m-APCC at 18 months within the female group (p=0.7347), and 0.41 points of improvement within the male group (p=0.3133).

Differences found in Prevention Group


For m-APCC at 18 months, women in the Prevention group improved by 4.7 (2.0) points (p=0.021) and men improved by 7.1 (2.4) points (p=0.004), with no significant difference between these groups (difference= 2.3 [3.1], p=0.524).
For CogAging scores at 18 months, women in the Prevention group improved by 0.5 (1.6) points (p=0.753) and men improved by 5.8 (1.9) points (p=0.003). There was no significant difference between these groups (difference= 5.3 [2.5], p=0.083).

Risk Scales

For ANU-ADRI at 18-months, women in the Prevention group decreased by 3.9 (1.5) points (p=0.011) and men decreased by 3.8 (1.7) points (p=0.027), with no significant difference between these groups (difference= 0.07 [2.3], p=0.979).
For CAIDE at 18 months, women in the Prevention group decreased by 0.4 (0.3) points (p=0.099) and men increased by 0.4 (0.3) points (p=0.166), with no significant difference between these groups (difference= 0.9 [0.4], p=0.082).
For ACC/AHA at 18 months, women in the Prevention group significantly decreased by 4.4 (1.0) points (p=<0.0001) and men decreased by 2.2 (1.2) points (p=0.057), with no significant difference between these groups (difference= 2.2 [1.5], p=0.245).
For MESA at 18 months, women in the Prevention group significantly decreased by 2.2 (0.2) points (p<0.0001) and men significantly decreased by 0.8 (0.3) points (p=0.007), with women significantly improving more than men (difference= 1.5 [0.4], p=0.001).


In the Prevention group, women showed improvements in HDL-C (9.7 [3.8], p=0.013). Men showed worsening of Cystatin C (0.1 [0.0], p=0.004) and improvement in HOMA-IR ( 0.7 [0.3], p=0.034). Women improved HDL-c more than men (difference= 13.8 [5.9], p=0.050), and men improved HOMA-IR more than women (difference= 1.0 [0.4], p=0.042).
No significant changes were seen within and between women and men for the remaining secondary outcomes (Table IV).

Table 4. Outcomes for Prevention Group

* indicates exploratory outcome measure

Differences found in Early Treatment Group


For the m-APCC at 18 months, women in the Early Treatment group improved by 1.4 (4.0) points (p=0.734) and men improved by 7.9 (5.3) points (p=0.138), with no significant difference between the groups (difference= 6.5 [6.6], p=0.330).
For CogAging scores at 18 months, women in the Early Treatment group improved by 3.6 (3.3) points (p=0.266) and men improved by 5.4 (4.2) points (p=0.207), with no significant difference between the groups (difference= 1.7 [5.3], p=0.743).

Risk Scales

For ANU-ADRI at 18 months, women in the Early Treatment group increased by 1.2 (2.9) points (p=0.687) and men decreased by 8.2 (4.1) points (p=0.051), with no significant difference between the groups (difference= 9.3 [5.0], p=0.063).
For CAIDE at 18 months, women in the Early Treatment group decreased by 1.4 (0.5) points (p=0.007) and men increased by 0.9 (0.7) points (p=0.187), with women significantly improving more than men (difference= 2.3 [0.8], p=0.007).
For ACC/AHA at 18 months, women in the Early Treatment group decreased by 5.5 (2.0) points (p=0.006) and men decreased by 5.6 (2.5) points (p=0.032), with no significant difference between the groups (difference= 0.0 [3.2], p=0.991).
For MESA at 18 months, women in the Early Treatment group decreased by 2.9 (0.5) points (p<0.0001) and men decreased by 1.2 (0.6) points (p=0.049), with women significantly improving more than men (difference= 4.1 [0.8], p<0.0001).


In Early Treatment participants, women showed improvement in HbA1c (-0.3 [0.1], p=0.025), blood glucose (-12.8 [4.9], p=0.011), and LDL-C (-44.4 [16.9] points, p=0.010). Men showed an increase in Cystatin C by (0.3 [0.1], p=0.006). Between women and men, there were differences seen in Cystatin C (difference= 0.4 [0.1], p=0.006) and HbA1c (difference= 0.6 [0.2], p=0.016).
No significant changes were seen within and between women and men for the remaining secondary outcomes (Table V).

Table 5. Outcomes for Early Treatment Group

* indicates exploratory outcome measure



To our knowledge, this is the first study to examine the differential effectiveness of individualized modifiable AD risk reduction between women and men. Previous studies have focused on the role of hormones and sex-specific risk factors when examining differences in AD risk(34), but none have examined if individualized multi-domain interventions result in differences in outcomes related to cognition and AD risk blood biomarkers. While no meaningful differences were seen in the primary outcome of cognitive improvement, we found significant improvements in secondary outcomes including CV risk scales and lipid biomarkers in women compared to men. Further research is needed to draw more definitive conclusions, but our findings suggest that the individualized management approach used by the CEDAR study in a real-world clinic may offer equal cognitive benefits to both women and men, as well as better mitigation of calculated AD and CV risk in women compared to men. Further research with larger cohorts is needed to examine if these better outcomes for women have a significant impact on their risk of developing AD.
In the Prevention group, both women and men improved their m-APCC scores without significant differences between these groups suggesting that an individualized approach that takes sex into consideration may be effective and warranted. Prior studies have suggested that in AD, men demonstrate more rapid rates of cognitive decline than women (35, 36), while other studies support the opposite (37). A recent study suggested that women and men have similar rates of cognitive decline until much later in life when women suffer from a sharp decline (38, 39). Our work highlights the need for larger studies that focus on sex differences in AD-related cognitive trajectories, as the existing body of knowledge lacks conclusive evidence on this issue.
In Early Treatment participants, women improved more than men on both the CAIDE and the MESA. In Prevention participants, women improved more than men on the MESA. The CAIDE is a validated risk index that calculates late-life dementia risk based on midlife vascular risk factors (e.g., body mass index, blood pressure, cholesterol smoking status), while the MESA estimates one’s risk of CV disease incidence over the next ten years using traditional risk factors. These results suggest that women saw greater reductions in their CV risk than men, and later on in the AD spectrum, this reduced CV risk may subsequently reduce the risk of AD. In support of these results, we found that women saw significant improvements in a number of vascular biomarkers, and this may be driving the CV disease risk reduction. Nevertheless, due to the small number of participants in these sub-groups, the significance of these findings are limited. This limitation is further discussed below.
Women in the Prevention group saw significant improvements in HDL cholesterol compared to men. Furthermore, women in the Early Treatment group saw significant improvements in several lipid biomarkers, including total cholesterol, LDL-C, LDL-P, and ApoB. Men in the Early Treatment saw no significant changes in any lipid biomarkers, and the differences between women and men were not found to be significant. However, these findings, when considered alongside the changes found in risk scales, suggest that when patients are further along on the AD spectrum, women may see greater CV benefit than men. It is uncertain why Prevention and Early Treatment women demonstrated improvements in different lipid biomarkers, though differences in age and consequently, estrogen levels may play an important role. Several studies have shown that estrogen can modulate LDL cholesterol absorption, and this relationship will be important to evaluate in further studies (40-42).
Differences found in metabolic markers were more difficult to interpret. Men in the Prevention group saw significantly more improvement in HOMA-IR than Prevention women, while women in the Early Treatment group significantly improved in HbA1c more than Early Treatment men. HOMA-IR and HbA1c have been proven to serve as effective markers for insulin resistance and diabetes diagnoses, which are among the leading risk factors for AD dementia (9). Thus, it is essential that future studies explore the effectiveness of multi-domain interventions targeting glucose metabolism with respect to differences in age, sex, and AD progression.
Our study has several limitations, with a key limitation being that this is a sub-group analysis. Dividing the original sample population into smaller sub-groups resulted in reduced statistical power, as such, detection of significant interactions may have been limited. Due to the small number of participants in the study, specifically in the Early Treatment sub-groups, as well as the vast outcome measures, it is important that our findings are to be considered hypothesis-generating and non-confirmatory. To address this gap, the study authors are in process of expanding a clinical research consortium (currently 6 sites in the United States, 1 in Canada and 1 in the United Kingdom) to expand the cohort, harmonize measures, and yield larger sample sizes upon which more valid conclusions can be made.
An expanded consortium would improve not only the sample size, but also the recruitment of a study population that is more diverse with respect to race, geography, and educational background. Although more than one-third of participants lived outside the New York metropolitan area, our cohort was predominantly Caucasian (85.0%) and, on average, well-educated (16.1 years), and this is an important limitation of our study. The original intent of this study was to have two sites, with the second site (Alzheimer’s Prevention Clinic and Research Center of Puerto Rico) recruiting 100 subjects to begin enrollment in August 2016. Due to a natural disaster (Hurricane Maria, September 2017) that had devastating effects on the clinic, all clinical research operations were halted.
Furthermore, significant differences were found within and between various sub-groups, and we must consider the increased likelihood of false-positive findings due to multiple comparisons across a broad spectrum of outcomes (43). Due to the nature of our analyses, we were not able to determine whether changes in any specific biomarkers were associated with change in cognition in women versus men. With the necessary sample size and power, future studies should seek to perform a Bayesian hierarchical analysis to identify biomarkers that are primarily associated with cognition changes. Nevertheless, future studies must continue to explore differences found in the effectiveness of AD risk reduction strategies within and between sub-groups defined by important baseline characteristics, such as age, sex, and genetic risk factors, as this can expand the body of evidence to inform individualized clinical paradigms.
To investigate sex differences in response to treatment, these analyses only included the participants marked as higher-compliance in the original CEDAR study, and this is an important limitation. This was done to assess for differences in intervention effects within a study cohort that had adhered to a majority of multi-domain interventions recommended. We believe this was the best way to assess for differential response to interventions, as conducting these analyses in lower-compliance participants may have resulted in false-positive findings that were not attributed to following the intervention. Nevertheless, due to the random nature of patient compliance and the inability to randomly assign participants to compliance levels, the sample size is considerably smaller compared to the original CEDAR study. Furthermore, only including higher-compliance participants may introduce bias to our results. We hope to conduct further analyses to continue exploring sex differences within a larger, more diverse sample of participants.



Individualized multi-domain interventions are equally effective in improving cognition in women and men. However, these interventions led to greater AD and CV risk reduction in women compared to men. Future study in larger cohorts with a priori primary and/or secondary outcomes is necessary to examine the effects of sex on AD risk reduction interventions.


Acknowledgements: The authors thank Dorothy Keine, PhD, of 3Prime Medical Writing, LLC for providing medical writing support.

Funding: This study was supported by the Women’s Alzheimer’s Movement; Zuckerman Family Foundation; Ace’s for Alzheimer’s; Altman Family Fund; Harry T. Mangurian, Jr. Foundation; philanthropic support from the patients of the Alzheimer’s Prevention Clinic; NIH/NCATS UL1TR002384 and NIH PO1AG026572. The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of data; in the preparation of the manuscript; or in the review or approval of the manuscript.

Trial registration: NCT03687710.

Conflict of interest: Dr. Isaacson has served as a scientific advisor for Acadia, Biogen, Genentech/Roche, Lilly, and Novo Nordisk. The other authors have nothing to disclose.

Ethical standard: All procedures performed in this study involving human participants were approved by and in accordance with the ethical standards of the IRB. Informed consent was obtained from all participants.

Open Access: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.





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