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From the *Department of Anesthesia and Pain Management and †Institute of Health Policy
Management and Evaluation, University of Toronto, Toronto, Ontario, Canada; ‡Department
of Anesthesia and Pain Management, University Health Network-Toronto Western Hospital,
Mount Sinai Hospital, Toronto, Ontario, Canada; §Department of Anesthesia and Pain
Management, Women's College Hospital, Toronto, Ontario, Canada; ‖Department of Paediatrics,
University of Toronto, Mount Sinai Hospital, Toronto, Ontario, Canada; ¶Department
of Anesthesiology and Critical Care Medicine and #Department of Physical Medicine
and Rehabilitation, Johns Hopkins School of Medicine, Baltimore, Maryland; and **Department
of Anesthesiology and ††Department of Physical Medicine and Rehabilitation, Walter
Reed National Military Medical Center, Bethesda, Maryland.