1. Interdepartmental Division of Critical Care Medicine and
2. Department of Anesthesiology and Pain Medicine, University of Toronto, Toronto, Ontario, Canada;
3. Department of Anesthesia, St. Michael’s Hospital, Toronto, Ontario, Canada;
4. The Pulmonary Center, Department of Medicine, Chobanian and Avedisian School of Medicine, Boston University, Boston, Massachusetts;
5. Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom;
6. Medical College of Wisconsin Libraries, Milwaukee, Wisconsin;
7. Department of Anesthesiology, Weill Cornell Medicine, New York, New York; and
8. Division of Health Systems Sciences, Medical School, University of Massachusetts, Boston, Massachusetts