1. Diabetes Center, 2nd Xiangya Hospital and Institute of Metabolism and Endocrinology, Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, 139 Renmin Middle Road, Changsha, Hunan 410011, China
2. The Center for Medical Research, 2nd Xiangya Hospital, Central South University, 139 Renmin Middle Road, Changsha, Hunan 410011, China