1. Beijing Tongren Hospital, Capital Medical University, Beijing, China;
2. Department of Endocrinology, Beijing Tongren Hospital, Capital Medical University, Beijing, China;
3. Department of Epidemiology, School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA, USA;
4. Department of Geriatrics, Beijing Tongren Hospital, Capital Medical University, Beijing, China;
5. Division of Nephrology, Beijing Friendship Hospital, Capital Medical University, Beijing, China;
6. Division of Education, Beijing Tongren Hospital, Capital Medical University, Beijing, China;
7. Beijing Key Laboratory of Diabetes Research and Care, Beijing, China