[1] George Washington Univ, Washington, DC USA
[2] Johns Hopkins Univ, Baltimore, MD USA
[3] Virginia Tech Caril Sch Med, Roanoke, VA USA
[4] Salem Vet Affairs Med Ctr, Salem, VA USA
[5] Virginia Tech Res Inst, Roanoke, VA USA
[6] Vet Aging Cohort Study, West Haven, CT USA