1 Department of Philosophy, University of Toronto, Toronto, ON, Canada.
2 Interdepartmental Division of Critical Care Medicine, University Health Network, Institute of Medical Science, Toronto General Hospital Research Institute, University of Toronto, Toronto, ON, Canada.
3 Critical Illness, Brain Dysfunction, and Survivorship (CIBS) Center, Tennessee Valley Veteran's Affairs Geriatric Research Education Clinical Center (GRECC), Vanderbilt University Medical Center, Nashville, TN.
4 Duke University School of Medicine, Durham, NC.
5 Division of Pulmonary, Allergy, and Critical Care Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA.