1. Department of Surgery, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
2. Department of Obstetrics and Gynaecology, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
3. Department of Obstetrics and Gynaecology, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada.
4. Department of Obstetrics and Gynaecology, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada.