1. Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
2. Department of Obstetrics and Gynecology, The Affiliated Jiangning Hospital of Nanjing Medical University, Nanjing, China
3. Department of Obstetrics and Gynecology, The Affiliated Sir Run Run Hospital of Nanjing Medical University, Nanjing, China
4. Department of Obstetrics and Gynecology, The Fourth Affiliated Hospital of Nanjing Medical University, Nanjing, China
5. Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Biochemistry and Molecular Biology, Nanjing Medical University, Nanjing, China