1. Department of Obstetrics and Gynecology, Taicang Hospital of Traditional Chinese Medicine (TCM) Affiliated to Nanjing University of Chinese Medicine, Taicang, Jiangsu 215400, P.R. China
2. Department of Obstetrics and Gynecology, Taicang Hospital of Traditional Chinese Medicine (TCM) Affiliated to Nanjing University of Chinese Medicine, Taicang, Jiangsu 215400, P.R. China
3. Department of Obstetrics and Gynecology, Suzhou Municipal Hospital, Suzhou, Jiangsu 215002, P.R. China