1. Central Laboratory, The First Hospital of Hebei Medical University, Shijiazhuang, P.R. China;
2. Department of Endocrinology, The First Hospital of Hebei Medical University, Shijiazhuang, P.R. China;
3. Department of Epidemiology and Statistics, School of Public Health, Hebei Medical University, Shijiazhuang, P. R. China;
4. Endoscopy Center, The First Hospital of Hebei Medical University, Shijiazhuang, P.R. China;
5. Department of Endocrinology, The Second Hospital of Shijiazhuang City, Shijiazhuang, P.R. China;
6. Hebei International Joint Research Center for Brain Science, Shijiazhuang, P.R. China