1. Department of Nutritional Sciences, University of Toronto, Toronto, Canad
2. Department of Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Canada
3. Division of Nutritional Sciences, College of Human Ecology, Cornell University, Ithaca, NY
4. Department of Medicine, St. Michael's Hospital and University of Toronto, Toronto, Canada
5. Department of Obstetrics and Gynecology, St. Michael's Hospital and University of Toronto, Toronto, Canada
6. freelance statistics consultant, Toronto, Canada
7. Department of Research Institute, the Hospital for Sick Children, Toronto, Canada