[1] Charlie Norwood Vet Affairs Med Ctr, Augusta, GA 30904 USA
[2] Augusta Univ, Dept Med, Med Coll Georgia, 1120 15th St, Augusta, GA 30912 USA
[3] Edward J Hines Jr VA Hosp, Ctr Innovat Complex Chron Healthcare, Hines, IL USA
[4] Loyola Univ, Stritch Sch Med, 2160 S 1st Ave, Maywood, IL 60153 USA
[5] Univ Illinois, Sch Publ Hlth, Dept Epidemiol & Biostat, Chicago, IL USA
[6] VA Puget Sound Hlth Care Syst, Seattle Div, Seattle, WA USA
[7] Univ Washington, Dept Rehabil Med, Seattle, WA 98195 USA
[8] Durham VA Med Ctr, Durham, NC USA
[9] Duke Univ, Dept Med, Durham, NC USA
[10] VAMC, Geriatr Res Educ & Clin Ctr, Durham, NC USA