[1] Univ Alabama Birmingham, Dept Med, Div Prevent Med, Birmingham, AL 35294 USA
[2] Vanderbilt Univ, Med Ctr, Dept Med, Div Gen Internal Med & Publ Hlth, Nashville, TN 37235 USA
[3] VISN11 Vet Engn Resource Ctr, Ctr Appl Syst Engn, Indianapolis, IN USA
[4] Iowa City VA Healthcare Syst, Ctr Comprehens Access & Delivery Res & Evaluat, Iowa City, IA USA
[5] Univ Iowa, Dept Internal Med, Carver Coll Med, Iowa City, IA 52242 USA
[6] VA Tennessee Valley Healthcare Syst, Geriatr Res Educ & Clin Ctr, Nashville, TN 37212 USA
[7] Brigham & Womens Hosp, Div Gen Med, BWH Hospitalist Serv, Boston, MA 02115 USA
[8] Harvard Med Sch, Boston, MA 02115 USA