1. Center for Obstetrics and Gynecology Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University Nanjing China
2. Center for Obstetrics and Gynecology, Nanjing Drum Tower Hospital Nanjing University Medical School Nanjing China
3. Center for Obstetrics and Gynecology Nanjing Drum Tower Hospital Clinical College of Xuzhou Medical University Nanjing China
4. Department of Blood Transfusion Nanjing Drum Tower Hospital, Nanjing University Medical School Nanjing China