1. Department of Gynecology I, First Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin, China
2. Heilongjiang University of Chinese Medicine, Harbin, China
3. Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong kong, China
4. Department of Obstetrics and Gynecology, Affiliated Hospital of Guizhou Medical University, Guiyang, China
5. Department of Obstetrics and Gynecology, Zhejiang Chinese Medical University, Hangzhou, China
6. State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School, Nanjing University, Nanjing, China
7. Centre for Reproductive Medicine, Heilongjiang Provincial Hospital, Harbin,China