1 Geriatric Research, Education and Clinical Center (GRECC), VA Northeast Ohio Healthcare System (VANEOHS), Cleveland, Ohio, USA.
2 Medicine Section, VANEOHS, Cleveland, Ohio, USA.
3 Division of Infectious Diseases & HIV Medicine in the Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
4 Department of Medicine, Division of Geriatric Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.
5 GRECC, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA.