Affiliation: | 1. Perelman School of Medicine, Division of Reproductive Endocrinology and Infertility, University of Pennsylvania, Philadelphia, PA;2. Department of Biostatistics, Epidemiology & Informatics, University of Pennsylvania, Philadelphia, PA;3. Department of Biostatistics & Informatics, Colorado School of Public Health and Departments of Obstetrics and Gynecology and Psychiatry, University of Colorado School of Medicine, Aurora, Colorado |