Bing Han1, Liqiong Xue2, Chengde Yang3. 1. Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. 2. Department of Endocrinology, Shanghai General Hospital, Shanghai Jiao Tong University, Shanghai, China. 3. Department of Rheumatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. Electronic address: yangchengde@sina.com.