[1] Vanderbilt Univ, Sch Med, Nashville, TN 37232 USA
[2] Michigan State Univ, Dept Family Med, Coll Human Med, Grand Rapids, MI USA
[3] Palliat Care Serv Spectrum Hlth, Grand Rapids, MI USA
[4] Vanderbilt Univ, Sch Med, Div Allergy Pulm & Crit Care Med, Nashville, TN 37212 USA
[5] Vanderbilt Univ, Sch Med, Dept Med, Ctr Hlth Serv Res, Nashville, TN 37212 USA
[6] Tennessee Valley Healthcare Syst, Dept Vet Affairs Med Ctr, Geriatr Res Educ & Clin Ctr, Nashville, TN USA