Affiliation: | a Department of Obstetrics and Gynaecology, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, Toronto, Ontariob Department of Obstetrics and Gynaecology, Ottawa General Hospital, University of Ottawa, Ottawa, Ontarioc Department of Obstetrics and Gynaecology, IWK Health Centre, Dalhousie University, Halifax, Nova Scotia, Canada |