1. Department of Obstetrics and Gynecology, Alpert Medical School, Brown University, Providence, RI, USA
2. Department of Obstetrics, Gynecology, and Reproductive Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX, USA
3. Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston, MA, USA