1. Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA;
2. New York University School of Medicine, New York, NY, USA;
3. Department of Obstetrics, Gynecology and Reproductive Sciences, Yale School of Medicine, New Haven, CT, USA;
4. Department of Biostatistics, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA;
5. Department of Obstetrics and Gynecology, Geisinger Health System, Danville, PA, USA