Author Contributions: Dr Scarmeas had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Scarmeas, Luchsinger, Brickman, Stern.
Acquisition of data: Scarmeas, Schupf, Stern.
Analysis and interpretation of data: Scarmeas, Luchsinger, Schupf, Brickman, Cosentino, Tang, Stern.
Drafting of the manuscript: Scarmeas, Brickman.
Critical revision of the manuscript for important intellectual content: Luchsinger, Schupf, Cosentino, Tang, Stern.
Statistical analysis: Scarmeas, Schupf, Cosentino, Tang.
Obtained funding: Scarmeas, Luchsinger, Stern.
Administrative, technical, or material support: Stern.
Study supervision: Scarmeas.
Financial Disclosures: None reported.
Funding/Support: The study was supported by National Institute on Aging grants AG028506 and P01-AG07232.
Role of the Sponsor: The National Institute on Aging financially supported the design and conduct of the study, the collection, management, analysis, and interpretation of the data, and the preparation of the manuscript, but was not involved in manuscript review or approval.