1. Key Laboratory of Neural and Vascular Biology, Ministry of Education, Hebei Medical University, Shijiazhuang, Hebei 050017, P.R. China
2. Department of Otorhinolaryngology‑Head and Neck Surgery, The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
3. Center for Reproductive Medicine, Family Planning Scientific and Technical Institution of Hebei Province, Shijiazhuang, Hebei 050000, P.R. China