1. ICES, Toronto, Ontario, Canada (D.S.L., M.J.S., T.O., A.C., T.A.S., P.C.A., J.V.T.).
2. Peter Munk Cardiac Centre and University Health Network, Toronto, Ontario, Canada (D.S.L., S.S.).
3. University of Toronto, Ontario, Canada (D.S.L., J.S.L., M.J.S., B.B., S.L.M., S.S., T.A.S., P.C.A., J.V.T.).
4. Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada (J.S.L., M.J.S., J.V.T.).
5. Schwartz/Reisman Emergency Medicine Institute, Sinai Health System, Toronto, Ontario, Canada (B.B., S.L.M.).
6. University of Western Ontario, London, Canada (M.L.E., J.F.D.).
7. Trillium Health Partners, Mississauga, Ontario, Canada (M.I.).
8. Department of Emergency Medicine and Integrative Biosciences Center, Wayne State University, Detroit, MI (P.D.L.).