1. Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangzhou 510515, P.R. China
2. Guangdong Provincial Key Laboratory of Gastroenterology, Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangzhou 510515, P.R. China
3. Department of Endocrinology, Nanfang Hospital/First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangzhou 510515, P.R. China
4. Department of Pathology, Nanfang Hospital/First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangzhou 510515, P.R. China