1. Division of Infectious Diseases, Department of Medicine; University of Alabama at Birmingham; Birmingham Alabama U.S.A
2. Division of Gerontology, Geriatrics, and Palliative Care, Department of Medicine; University of Alabama at Birmingham; Birmingham Alabama U.S.A
3. Department of Health Behavior; School of Public Health, University of Alabama at Birmingham; Birmingham Alabama U.S.A
4. Division of Geriatrics, Department of Medicine; University of California at San Francisco, Jewish Home of San Francisco Center for Research on Aging; San Francisco California U.S.A
5. Department of Psychiatry and Behavioral Sciences; Johns Hopkins University School of Medicine; Baltimore Maryland U.S.A
6. Department of Anesthesiology, Department of Psychiatry and Psychology; The Mayo Clinic; Rochester Minnesota U.S.A