1. Department of Endocrinology, The First Medical Center, Chinese PLA General Hospital, Beijing 100853, China
2. Department of Endocrinology, The Second Medical Center and National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing 100853, China
3. Department of Endocrinology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Institute of Endocrine and Metabolic Diseases, Shanghai 200025, China.