1 Department of Endocrinology, Drum Tower Hospital Affiliated to Nanjing University Medical School, No 321, Zhongshan Road, Nanjing, 210008, Jiangsu, China.
2 Department of General Surgery, Drum Tower Hospital Affiliated to Nanjing University Medical School, Nanjing, China.
3 Department of Endocrinology, Drum Tower Hospital Affiliated to Nanjing University Medical School, No 321, Zhongshan Road, Nanjing, 210008, Jiangsu, China. biyan@nju.edu.cn.