1. Gynecology Department, The Second Affiliated Hospital, Medical College of Zhejiang University, Hangzhou, Zhejiang, China
2. Department of Obstetrics, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), Hangzhou, Zhejiang, China
3. Department of Gynecology, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), Hangzhou, Zhejiang, China.