| Affiliation: | 1. Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, Canada;2. Departments of Pediatrics and of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Canada;3. Division of Epidemiology, School of Public Health, University of California at Berkeley, Berkeley, CA;4. School of Nursing, University of Pittsburgh, Pittsburgh, PA;5. Oregon Health Sciences University‐Portland State University School of Public Health, Portland, OR;6. Department of Obstetrics and Gynecology, University of Pittsburgh, Pittsburgh, PA;7. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA |
