| Affiliation: | 1. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;2. Department of Obstetrics, Gynecology, and Reproductive Sciences, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;3. Magee‐Womens Research Institute, Pittsburgh, Pennsylvania, USA;4. Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada;5. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA;6. Division of Epidemiology, University of California at Berkeley School of Public Health, Berkeley, California, USA |
