[1] Vanderbilt Univ, Sch Med, Dept Internal Med, Nashville, TN 37212 USA
[2] Vanderbilt Univ, Sch Med, Div Allergy Pulm & Crit Care Med, Nashville, TN 37212 USA
[3] Vanderbilt Univ, Sch Med, Ctr Hlth Serv Res, Nashville, TN 37212 USA
[4] Rehabil Hosp Ancelle Cremona, Cremona, Italy
[5] Geriatr Res Grp, Brescia, Italy
[6] Vanderbilt Univ, Sch Med, Ctr Qual Aging, Nashville, TN 37212 USA
[7] Vanderbilt Univ, Sch Med, Div Gen Internal Med & Publ Hlth, Nashville, TN 37212 USA
[8] Tennessee Valley Healthcare Syst, Geriatr Res Educ & Clin Ctr GRECC Serv, Dept Vet Affairs Med Ctr, Nashville, TN USA