1. Departments of Pediatrics (Neonatology), and
2. Department of Pediatrics (Neonatology), Faculty of Medicine, McGill University, Montreal, Quebec, Canada;
3. Maternal-Infant Care (MiCare) Research Centre, Toronto, Ontario, Canada;
4. Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada; and
5. Obstetrics and Gynecology, Sainte-Justine University Hospital and Research Centre, University of Montreal, Quebec, Canada;
6. Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada