1. From the University of Toronto, Toronto, ON, Canada (S.C., B.B., L.M.); University of Washington, Seattle (R.H.S., T.R., J.P., S.M., L.V.O., M.O.); University of British Columbia, Vancouver, BC, Canada (J.C.); University of Pittsburgh, Pittsburgh, Pennsylvania (J.J.M., D.D.S.); St. Paul's Hospital, Vancouver, BC, Canada (S.P.); Region of Peel, Emergency Medical Services, Brampton, ON, Canada (J.S.); University of Chicago Medical Center, Chicago, IL (D.E.); University of Ottawa, Ottawa, ON, Canada (I...