[1] Vanderbilt Univ, Dept Emergency Med, Med Ctr, 703 Oxford House, Nashville, TN 37232 USA
[2] Univ Edinburgh, Geriatr Med Unit, Edinburgh Delirium Res Grp, Edinburgh, Midlothian, Scotland
[3] Univ Edinburgh, Ctr Cognit Ageing & Cognit Epidemiol, Edinburgh, Midlothian, Scotland
[4] Vanderbilt Univ, Dept Med, Div Allergy Pulm & Crit Care, Med Ctr, Nashville, TN 37232 USA
[5] Dept Vet Affairs Med Ctr, Tennessee Valley Hlth Care Ctr, Geriatr Res Educ & Clin Ctr, Nashville, TN 37212 USA
[6] Vanderbilt Univ, Ctr Qual Aging, Div Allergy Pulm & Crit Care, Med Ctr, Nashville, TN 37232 USA
[7] Vanderbilt Univ, Dept Biostat, Med Ctr, Nashville, TN 37232 USA