1. Department of Obstetrics and Gynecology, the Fourth Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
2. Department of Obstetrics and Gynecology, the Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
3. Nanjing Maternity and Child Health Care Hospital, Nanjing, Jiangsu, China
4. Department of Rheumatology, the Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, China