[1] Vanderbilt Univ Sch Med, Ctr Hlth Serv Res, Nashville, TN USA
[2] Vanderbilt Univ Sch Med, Div Allergy Pulm & Crit Care Med, Dept Med, Nashville, TN USA
[3] Vanderbilt Univ Sch Med, Dept Anesthesiol, Div Crit Care, Nashville, TN USA
[4] Tennessee Valley Healthcare Syst, Geriatr Res Educ & Clin Ctr GRECC Serv, Nashville, TN USA
[5] Tennessee Valley Healthcare Syst, Clin Res Training Ctr Excellence CRCoE, Nashville, TN USA
[6] Tennessee Valley Healthcare Syst, Dept Vet Affairs Med Ctr, Anesthesiol Serv, Nashville, TN USA
[7] Vanderbilt Univ Sch Med, Div Gen Internal Med & Publ Hlth, Nashville, TN USA