1 Department of Paediatrics, Hospital for Sick Children, University of Toronto, Toronto;
2 Department of Paediatrics, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, Ontario;
3 Department of Paediatrics, British Columbia Women's Hospital and Health Centre, University of British Columbia, Vancouver, British Columbia;
4 Department of Paediatrics, Centre hospitalier universitaire Sainte-Justine, Université de Montréal;
5 Department of Paediatrics, Montreal Children's Hospital, McGill University, Montreal, Quebec;
6 Department of Paediatrics, Centre hospitalier universitaire Sainte-Justine, Université de Montréal; ; Department of Paediatrics, Montreal Children's Hospital, McGill University, Montreal, Quebec;
7 Department of Paediatrics, Hamilton Health Sciences, McMaster University, Hamilton, Ontario;
8 Department of Paediatrics, Stollery Children's Hospital, University of Alberta, Edmonton, Alberta;
9 Department of Obstetrics and Gynecology, St Michael's Hospital, University of Toronto, Toronto, Ontario;
10 Department of Obstetrics and Gynecology, Women's Health Research Institute, British Columbia Women's Hospital and Health Centre, University of British Columbia, Vancouver, British Columbia.