1. Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Shaw Hospital, Zhejiang University School of Medicine , Shangcheng District, Hangzhou 310016 , China
2. Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province , Shangcheng District, Hangzhou 310016 , China
3. Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University , No. 109 Xueyuan WestRoad, Lucheng District, Wenzhou 325000 , China