Affiliation: | 1. Division of Epidemiology, Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH;2. Department of Epidemiology and Social Science on Reproductive Health, Shanghai Institute of Planned Parenthood Research, Shanghai, China;3. Division of Maternal‐Fetal Medicine, Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine and Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH |