1. Department of Endocrinology, Peking University First Hospital, Beijing 100034, P.R. China
2. Institute of Clinical Pharmacology, Peking University First Hospital, Beijing 100034, P.R. China
3. Department of Endocrinology, Peking University Shougang Hospital, Beijing 100144, P.R. China
4. Department of Biostatistics, Peking University First Hospital, Beijing 100034, P.R. China