1 Critical Illness, Brain Dysfunction, and Survivorship Center, 2525 West End Avenue, 4th Floor, Nashville, Tennessee.
2 Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee.
3 Geriatric Research, Education and Clinical Center Service, Veterans Affairs Tennessee Valley Healthcare System, Nashville Veterans Affairs Medical Center, Nashville, Tennessee.
4 Department of Medicine, Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
5 Division of Trauma, Emergency General Surgery, & Surgical Critical Care, Departments of Surgery, Neurosurgery, and Hearing & Speech Sciences, Section of Surgical Sciences, Vanderbilt University Medical Center, Nashville, Tennessee.