1. Department of Gynecology and Obstetrics The Third Affiliated Hospital of Soochow University Changzhou Jiangsu China
2. Department of Gynecology The Affiliated Changzhou Maternity and Child Health Care Hospital of Nanjing Medical University Changzhou Jiangsu China
3. Department of Obstetrics The Affiliated Changzhou Maternity and Child Health Care Hospital of Nanjing Medical University Changzhou Jiangsu China