1. Department of Gynaecology, Lishui Hospital of Traditional Chinese Medicine, Lishui, China
2. Department of Ultrasound, Jiaojiang Maternal and Child Health Hospital, Taizhou, China
3. Department of Gynecology, Huzhou Maternity and Child Health Care Hospital, Huzhou, China
4. Department of Gynecology, Changxing People’s Hospital of Chongming District, Shanghai City, China
5. Department of Gynecology, Jiaojiang Maternal and Child Health Hospital, Taizhou, China
6. Department of Obstetrics and Gynecology, Hangzhou TCM Hospital affiliated to Zhejiang Chinese Medical University, Hangzhou,China