1. National Clinical Research Center for Metabolic Diseases, Key Laboratory of Diabetes Immunology (Central South University), Ministry of Education, and Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University , Changsha, Hunan 410011 , China
2. Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia Health System , Charlottesville, VA 22903 , USA