1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhejiang University of Traditional Chinese Medicine, Hangzhou, Zhejiang 310006, China
2. Department of Gynecology, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210004, China
3. The First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong 515041, China