1 Department of Emergency Medicine, Dalhousie Medicine New Brunswick, Horizon Health Network, Saint John, NB, Canada. Paul.atkinson@dal.ca.
2 Department of Emergency Medicine, Dalhousie Medicine New Brunswick, Horizon Health Network, Saint John, NB, Canada.
3 Department of Emergency Medicine, The Dr Everett Chalmers Regional Hospital, Dalhousie Medicine New Brunswick, Horizon Health Network, Fredericton, NB, Canada.
4 Department of Emergency Medicine, University of Toronto, Schwartz/Reisman Emergency Medicine Institute, North York General Hospital, Toronto, ON, Canada.