1. Graduate School, Hebei North University, Zhangjiakou, Hebei 075000, P.R. China
2. Department of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
3. Department of Gynecology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
4. Department of Thoracic Surgery, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
5. Clinical Medical Research Center and Geriatric Key Laboratory, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
6. Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050017, P.R. China
7. Department of Oncology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China