[1] Vanderbilt Univ, Dept Med, Div Allergy Pulm & Crit Care Med, Med Ctr, 221 Kirkland Hall, Nashville, TN 37235 USA
[2] Crit Illness Brain Dysfunct & Survivorship CIBS C, Nashville, TN 37203 USA
[3] Vanderbilt Univ, Dept Anesthesiol, Div Crit Care Med, Med Ctr, Nashville, TN USA
[4] Vanderbilt Univ, Inst Med & Publ Hlth, Vanderbilt Ctr Hlth Serv Res, Med Ctr, Nashville, TN USA
[5] Vet Affairs Tennessee Valley Healthcare Syst, Geriatr Res Educ & Clin Ctr GRECC, Nashville, TN USA
[6] Vanderbilt Ctr Qual Aging, Inst Med & Publ Hlth, Nashville, TN USA