[1] Vet Affairs Med Ctr, Ctr Geriatr Res Educ & Clin, Baltimore, MD 21201 USA
[2] Univ Maryland, Sch Med, Dept Internal Med, Baltimore, MD 21201 USA
[3] Univ Maryland, Sch Med, Div Gerontol, Baltimore, MD 21201 USA
[4] Wake Forest Univ, Sch Med, Dept Pathol, Winston Salem, NC 27109 USA