1. The Third Clinical Medical Collage, Zhejiang Chinese Medical University, Hangzhou, China
2. The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, China
3. The First Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, China
4. The Fourth Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, China
5. Department of Gynecology and Obstetrics, Zhejiang Provincial People’s Hospital, People’s Hospital of Hangzhou Medical College, Hangzhou, China.