Jianping Weng1,2, Zhiguang Zhou3, Lixin Guo4. 1. 1Department of Endocrinology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China. 2. 2Department of Endocrinology and Metabolism, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China. 3. 3Department of Endocrinology and Metabolism, The Second Xiangya Hospital of Central South University, Changsha, China. 4. 4Department of Endocrinology, Beijing Hospital, Beijing, China.