1. Department of Epidemiology; Biostatistics and Occupational Health; McGill University; Montreal QC Canada
2. Centre for Clinical Epidemiology; Lady Davis Institute; Jewish General Hospital; Montreal QC Canada
3. McGill University Health Center Research Institute; Montreal QC Canada
4. Department of Pediatrics; McGill University; Montreal QC Canada
5. Department of Family Medicine; St. Mary's Hospital Centre; McGill University; Montreal QC Canada
6. Department of Obstetrics and Gynecology; McGill University; Montreal QC Canada
7. Department of Medicine; McGill University; Montreal QC Canada