1. Department of Endocrinology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
2. Hebei Key Laboratory of Metabolic Diseases, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
3. Clinical Laboratory, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
4. Department of Rheumatism and Immunology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China