Author Contributions: Dr James 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: James, Bennett, Schneider.
Acquisition of data: Bennett, Schneider.
Analysis and interpretation of data: James, Bennett, Boyle, Leurgans, Schneider.
Drafting of the manuscript: James, Schneider.
Critical revision of the manuscript for important intellectual content: James, Bennett, Boyle, Leurgans, Schneider.
Statistical analysis: James, Bennett, Leurgans, Schneider.
Obtained funding: Bennett, Boyle.
Administrative, technical, or material support: Bennett.
Study supervision: Bennett, Schneider.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr James reported serving as a consultant to the Alzheimer's Association and Partners. Dr Schneider reported being a consultant to AVID Radiopharmaceuticals Inc, GE Healthcare, and Eli Lilly. No other author reported disclosures.
Funding/Support: This research was supported by National Institute on Aging grants P30AG10161, R01AG15819, R01AG17917, R01AG34374, R01AG33678, RC2AG36547, P01AG14449, P01AG09466, and R01NS028127, and the Illinois Department of Public Health.
Role of the Sponsors: National Institute on Aging and the Illinois Department of Public Health had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
This article was corrected for errors on May 1, 2012.