1. Department of Endocrinology and Metabolism, People's Hospital of Tibet Autonomous Region, Lhasa, Tibet, China.
2. Department of Endocrinology and Metabolism, Peking University of People's Hospital, Beijing, China.
3. Department of Endocrinology and Metabolism and the Institute of Endocrinology, The First Hospital of China Medical University, Shenyang, Liaoning, P.R. China.