1. Department of Obstetrics and Gynecology, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin 150040, China
2. Department of Obstetrics and Gynecology, Heilongjiang University of Chinese Medicine, Harbin 150040, China
3. Department of Internal Medicine, Heilongjiang University of Chinese Medicine, Harbin 150040, China
4. Department of Internal Medicine, First Affiliated Hospital, Heilongjiang University of Chinese Medicine, Harbin 150040, China