1. Research Service; Veterans Affairs San Diego Healthcare System; San Diego California
2. Department of Psychiatry; University of California at San Diego; La Jolla California
3. Taub Institute for Research in Alzheimer's Disease and the Aging Brain; Columbia University; New York New York
4. Department of Epidemiology; Bloomberg School of Public Health; Johns Hopkins University; Baltimore Maryland
5. Veterans Affairs Greater Los Angeles Healthcare System; Los Angeles California
6. Vanderbilt Memory & Alzheimer's Center; Department of Neurology; Vanderbilt University Medical Center; Nashville Tennessee
7. Department of Radiology and Radiological Sciences; Center for Biomedical Imaging; Medical University of South Carolina; Charleston South Carolina
8. Department of Neurology; Virginia Commonwealth University School of Medicine; Richmond Virginia
9. RAND Corporation; Arlington Virginia
10. North Florida/South Georgia Veterans Health System; Gainesville Florida
11. Department of Epidemiology; Joseph P. Mailman School of Public Health; Columbia University; New York New York
12. Gertrude H. Sergievsky Center; Columbia University; New York New York
13. Departments of Psychiatry; College of Physicians and Surgeons; Columbia University; New York New York
14. Department of Neurology; College of Physicians and Surgeons; Columbia University; New York New York
15. Medicine; College of Physicians and Surgeons; Columbia University; New York New York