About the Authors

Rochelle E. Tractenberg

ret7@georgetown.edu

Affiliations Departments of Neurology, Biostatistics, Bioinformatics & Biomathematics, and Psychiatry, Georgetown University School of Medicine, Washington, D.C., United States of America, Collaborative for Research on Outcomes and Metrics, Washington, D.C., United States of America

Robert H. Pietrzak

Affiliations Clinical Neurosciences Division, National Center for Posttraumatic Stress Disorder, VA Connecticut Healthcare System and Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut, United States of America, Collaborative for Research on Outcomes and Metrics, Washington, D.C., United States of America

Competing Interests

RET is an academic editor at PLoS ONE. RHP declares no competing interests. ADNI is funded by the National Institute on Aging, the National Institute of Biomedical Imaging and Bioengineering, and through generous contributions from the following: Abbott, AstraZeneca AB, Bayer Schering Pharma AG, Bristol-Myers Squibb, Eisai Global Clinical Development, Elan Corporation, Genentech, GE Healthcare, GlaxoSmithKline, Innogenetics, Johnson and Johnson, Eli Lilly and Co., Medpace, Inc., Merck and Co., Inc., Novartis AG, Pfizer Inc, F. Hoffman-La Roche, Schering-Plough, Synarc, Inc., and Wyeth, as well as non-profit partners the Alzheimer's Association and Alzheimer's Drug Discovery Foundation, with participation from the U.S. Food and Drug Administration. Private sector contributions to ADNI are facilitated by the Foundation for the National Institutes of Health (www.fnih.org). The grantee organization is the Northern California Institute for Research and Education, and the study is coordinated by the Alzheimer's Disease Cooperative Study at the University of California, San Diego. ADNI data are disseminated by the Laboratory for Neuro-Imaging at the University of California, Los Angeles. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: RET. Performed the experiments: RET. Analyzed the data: RET. Contributed reagents/materials/analysis tools: RET RHP. Wrote the paper: RET RHP. Expert neuropsychological input and guidance for interpretation and background: RHP.