1. Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
2. Department of Health Care, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
3. Hebei Key Laboratory of Metabolic Diseases, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China