1 Department of Family & Community Medicine, Division of Emergency Medicine, University Health Network, Toronto General Hospital Research Institute, University of Toronto, Toronto, ON, Canada. edward.xie@utoronto.ca.
2 Emergency Department, RFE Building, Toronto General Hospital, Toronto, ON, Canada. edward.xie@utoronto.ca.
3 Division of Emergency Medicine, McMaster University, Hamilton, ON, Canada.
4 Department of Emergency Medicine, Royal Alexandra Hospital, University of Alberta, Edmonton, AB, Canada.
5 Department of Emergency Medicine, University of Alberta, Edmonton, AB, Canada.
6 Department of Emergency Medicine, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada.
7 Department of Family and Community Medicine, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.
8 Department of Emergency Medicine, St Joseph's Health Centre, Unity Health Toronto, Inner City Health Associates, Toronto, ON, Canada.
9 Division of Emergency Medicine, University Health Network, Toronto, ON, Canada.
10 Department of Family & Community Medicine, University of Toronto, Toronto, ON, Canada.
11 Department of Medicine, University of Toronto, Toronto, ON, Canada.
12 Department of Medicine, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada.
13 Medical Officer of Health, Central Zone, Alberta, Canada.
14 Department of Emergency Medicine, University of Calgary, Calgary, AB, Canada.
15 Department of Family and Community Medicine, University Health Network, Toronto General Hospital Research Institute, University of Toronto, Toronto, ON, Canada.
16 Toronto General Hospital, 200 Elizabeth Street, R. Fraser Elliott Building, Ground Floor, Room 480, Toronto, ON, M5G 2C4, Canada.
17 B804 Women's Centre, Royal Alexandra Hospital, 10240 Kingsway Avenue, Edmonton, AB, T5H 3V9, Canada.