1 Department of Clinical Epidemiology, Ottawa Hospital Research Institute, Ottawa, ON.
2 Department of Clinical Epidemiology, Ottawa Hospital Research Institute, Ottawa, ON; Department of Radiology, University of Ottawa, Ottawa, ON.
3 Department of Radiology, University of Ottawa, Ottawa, ON.
4 Ottawa-Carleton Institute of Biomedical Engineering, Ottawa, ON.
5 Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, ON.
6 Department of Clinical Epidemiology, Ottawa Hospital Research Institute, Ottawa, ON; Department of Obstetrics and Gynecology, University of Ottawa, Ottawa, ON. Electronic address: susingh@toh.ca.