1. Department of Traditional Chinese Medicine, Hangzhou Women's Hospital, Hangzhou, Zhejiang, China.
2. Department of gynecology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China.
3. Zhejiang Chinese medical university, Hangzhou, Zhejiang, China.
4. Ultrasonography Department, Hangzhou Women's Hospital, Hangzhou, Zhejiang, China.