1. Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
2. The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
3. Nanhai Hospital of Southern Medical University, Foshan Shi, China.
4. Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, Ontario, Canada.
5. Department of Obstetrics and Gynaecology, University of Auckland, Auckland, New Zealand.