1. Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario, Canada
2. Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada
3. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, 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, Hamilton, Ontario, Canada
6. Division of Maternal-Fetal Medicine, McMaster University, Hamilton, Ontario, Canada