1 From the *Department of Anesthesia and Pain Management and †Institute of Health Policy Management and Evaluation, University of Toronto, University Health Network, Toronto Western Hospital, Toronto, Ontario, Canada; ‡Department of Anesthesiology and Perioperative Care, University of California Irvine School of Medicine, Irvine, California; Departments of §Anesthesiology and Critical Care Medicine, ‖Neurology, and ¶Physical Medicine and Rehabilitation, Johns Hopkins School of Medicine, Baltimore, Maryland; and Departments of #Anesthesiology and **Physical Medicine and Rehabilitation, Walter Reed National Military Medical Center, Bethesda, Maryland.