1. Department of Gastroenterology Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Nanjing China
2. Jiangsu Clinical Medical Center of Digestive Disease Nanjing China
3. State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Diseases Xijing Hospital The Fourth Military Medical University Xi'an China
4. The Second Outpatient Department of Chengdu Army Region Authority Chengdu China