Jin-Hua Yan1, Guo-Chao Zhang1, Yan-Hua Zhu1, Bin Yao2. 1. Department of Endocrinology, The Third Affiliated Hospital of SUN Yat-Sen University, Guangzhou, China. 2. Department of Endocrinology, The Third Affiliated Hospital of SUN Yat-Sen University, Guangzhou, China. Electronic address: yanjh79@163.com.