1. The Fourth School of Clinical Medicine, Zhejiang Chinese Medical University, Zhejiang 310053, China
2. Yuhang District First People’s Hospital, Zhejiang 310053, China
3. Hangzhou Lin’an District No.4 People’s Hospital, Zhejiang 310053, China
4. Department of Obstetrics and Gynecology, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Zhejiang 310008, China
5. Department of Obstetrics and Gynecology, Hangzhou Women’s Hospital, Zhejiang 310008, China