1. Department of Obstetrics and Gynecology, Hospital of the University of Pennsylvania, Philadelphia, PA, USA;
2. Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, University of Wisconsin, Madison, WI, USA;
3. Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Hospital of the University of Pennsylvania, Philadelphia, PA, USA;
4. Monash Centre for Health Research and Implementation, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia