[1] Univ Naples Federico II, Dept Neurosci Reprod & Odontostomatol Sci, Via Pansini 5, I-80131 Naples, Italy
[2] Vanderbilt Univ, Sch Med, Crit Illness Brain Dysfunct & Survivorship CIBS C, Nashville, TN 37212 USA
[3] Vanderbilt Univ, Sch Med, Dept Med, Div Allergy Pulm & Crit Care Med, Nashville, TN 37212 USA
[4] Tennessee Valley Healthcare Syst, Dept Vet Affairs, Med Ctr, Geriatr Res Educ & Clin Ctr GRECC, Nashville, TN USA
[5] Vanderbilt Univ, Sch Med, Ctr Hlth Serv Res, Nashville, TN 37212 USA