1. Department of Internal Medicine, Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
2. Clinical Laboratory, 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
4. Hebei Provincial Physical Examination Center, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China