1 Critical Illness, Brain Dysfunction, and Survivorship (CIBS) Center and the Center for Health Services Research, Vanderbilt University Medical Center, Nashville, TN.
2 Department of Anesthesiology, Division of Anesthesia Critical Care Medicine, Vanderbilt University Medical Center, Nashville, TN.
3 Department of Biostatistics, Vanderbilt University, Nashville, TN.
4 Nashville Veterans Affairs Medical Center, Tennessee Valley Healthcare System, Nashville, TN.