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 of Soochow University, Suzhou, China
3. Jiangsu Institute of Clinical Immunology, The First Affiliated Hospital of Soochow University, Suzhou, China
4. Affiliated Hospital of Medical School, Nanjing University, Nanjing Stomatological Hospital, Nanjing, China
5. Department of Gynecology and Obstetrics, West China Second Hospital, University of Sichuan, Chengdu, China
6. Key Laboratory of Obstetric & Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education, West China Second Hospital, University of Sichuan, Chengdu, China