1. Department of Gastroenterology; Affiliated Drum Tower Hospital of Nanjing University, Medical School; Nanjing Jiangsu Province China
2. Department of Gastroenterology; Second Affiliated Hospital of Zhejiang University School of Medicine; Hangzhou Zhejiang Province China
3. Department of Pathology; Affiliated Drum Tower Hospital of Nanjing University, Medical School; Nanjing Jiangsu Province China
4. Department of Surgery; Veterans Affairs Boston Healthcare System and Harvard Medical School; West Roxbury Massachusetts USA
5. Department of Pathology and Laboratory Medicine; Veterans Affairs Boston Healthcare System and Harvard Medical School; West Roxbury Massachusetts USA