1. Department of Obstetrics and Gynecology, Yancheng Hospital of Traditional Chinese Medicine, Yancheng, Jiangsu 224000, P.R. China
2. Department of traditional Chinese Medicine, Traditional Chinese Medicine Cangzhou Integrated Traditional Chinese and Western Medicine Hospital, Cangzhou, Hebei 061000, P.R. China
3. School of Basic Medicine, Hebei University of Traditional Chinese Medicine, Shijiazhuang, Hebei 050000, P.R. China
4. Department of traditional Chinese Medicine, Liuzhou People's Hospital, Liuzhou, Guangxi 545000, P.R. China
5. Department of traditional Chinese Medicine, Heyi Community Health Service Center, Beijing 100000, P.R. China