1. Department of Obstetrics and Gynecology, University of Central Florida , Orlando, FL 32827 , United States
2. Department of Obstetrics and Gynecology, Boonshoft School of Medicine, Wright State University , Fairborn, OH 45324 , United States
3. Department of Obstetrics and Gynecology, Keck School of Medicine of University of Southern California , Los Angeles, CA 90033 , United States
4. Department of Obstetrics and Gynecology, College of Medicine, Penn State University, State College, PA 16801 , United States
5. Center for Reproductive Medicine, Renji Hospital; School of Medicine, Shanghai Jiao Tong University , Shanghai 200025 , China