1. Department of Obstetrics and Gynecology; McMaster University; Hamilton ON Canada
2. Department of Clinical Epidemiology and Biostatistics; McMaster University Hamilton, ON Canada
3. Sunnybrook Health Sciences Centre; Toronto ON Canada
4. Department of Obstetrics and Gynecology; University of Toyama; Toyama Japan
5. Department of Obstetrics and Gynecology; University of Adelaide; Adelaide Australia
6. Department of Paediatrics; University of Toronto; Toronto ON Canada
7. The Society of Obstetricians and Gynaecologists of Canada; Ottawa ON Canada
8. Department of Family and Community Medicine; University of Toronto; Toronto ON Canada
9. Department of Pediatrics; McMaster University; Hamilton ON Canada
10. The First Affiliated Hospital of Xi'an Jiaotong University; Xi'an Shaanxi Province China
11. Canadian Premature Babies Foundation; Sherwood Park AB Canada
12. Maternal Fetal Medicine Clinic; Windsor Regional Hospital; Windsor ON Canada
13. Division of Obstetrics and Gynecology; Escuela de Medicina; Pontificia Universidad Católica de Chile; Santiago Chile
14. Midwifery Education Program; McMaster University; Hamilton ON Canada