[1] Univ Alabama, Appl Gerontol Program, Ctr Mental Hlth & Aging, Tuscaloosa, AL 35487 USA
[2] Univ Alabama Birmingham, Sch Med, Div Gerontol Geriatr Med, Birmingham, AL USA
[3] Univ Alabama Birmingham, Dept Biostat, Birmingham, AL 35294 USA
[4] Univ S Florida, Dept Gerontol, Tampa, FL USA