1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Soochow University, Suzhou, China
2. Clinical Research Center of Obstetrics and Gynecology, Jiangsu Key Laboratory of Clinical Immunology, Soochow University, Suzhou, China
3. Jiangsu Institute of Clinical Immunology, The First Affiliated Hospital of Soochow University, Suzhou, China
4. Department of Obstetrics and Gynecology, Nanjing Maternity and Child Health Hospital, Nanjing, China
5. Department of Gynecology and Obstetrics, Changzhou Maternal and Child Health Care Hospital Affiliated Nanjing Medical University, Changzhou, China
6. Department of Gynecology, The First Affiliated Hospital of Zhejiang University Medical College, Hangzhou, China
7. Department of Obstetrics and Gynecology, TuHa Petroleum Hospital, Xinjiang, China.