1. Reproductive Medicine Center, The Fourth Hospital of Shijiazhuang, (Affiliated Obstetrics and Gynecology Hospital of Hebei Medical University), Shijiazhuang, Hebei, China
2. North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei, China
3. Department of Pathology and Pathophysiology, Hebei Medicine University, Shijiazhuang, Hebei, China
4. Hebei Traditional Chinese Medicine Hospital, Shijiazhuang, Hebei, China