1. Center for Reproductive Medicine, Department of Gynecology, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital, Hangzhou Medical College), Hangzhou, Zhejiang, China
2. Department of Obstetrics and Gynecology, Shengli Clinical Medical College of Fujian Medical University and Fujian Provincial Hospital, Fuzhou, China
3. Tiantai People’s Hospital of Zhejiang Province, Zhejiang, China