1. Department of Obstetrics and Gynecology, McMaster University, Ontario, Canada
2. Department of Health Research Methods, Evidence, and Impact, McMaster University, Ontario, Canada
3. Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Toronto, Toronto, Ontario, Canada
4. Division of Neonatology, Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada
5. Department of Radiology, McMaster University, Ontario, Canada
6. Division of Maternal-Fetal Medicine, McMaster University, Ontario, Canada