1. Department of Gynecology, Nanjing Medical University, Affiliated Hangzhou Hospital (Hangzhou First People's Hospital, Hangzhou Obstetrics & Gynecology Hospital), Hangzhou, Zhejiang Province, China
2. Department of Obstetrics, Nanjing Medical University, Affiliated Hangzhou Hospital (Hangzhou First People's Hospital, Hangzhou Obstetrics & Gynecology Hospital), Hangzhou, Zhejiang Province, China