1. Department of Critical Care Medicine, University of Calgary and Alberta Health Services, Calgary, Alberta, Canada;
2. Department of Community Health Sciences,
3. O’Brien Institute for Public Health,
4. Department of Psychiatry, and
5. Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada;
6. Tennessee Valley Veterans Affairs Geriatric Research Education Clinical Center, Nashville Tennessee; and
7. Critical Illness, Brain Dysfunction, and Survivorship Center, Vanderbilt University Medical Center, Vanderbilt University, Nashville Tennessee