1. Department of Obstetrics and Gynecology The First People's Hospital of Shuangliu District Chengdu China
2. Department of Internal Medicine Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital Chengdu China
3. School of Clinical Medicine Zunyi Medical University Zunyi China
4. School of Clinical Medicine Chengdu Medical College Chengdu China
5. Assisted Reproductive Centre Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital Chengdu China