1. Department of Medicine, Division of Digestive DiseasesEmory University School of Medicine Atlanta GA
2. Department of Gastroenterology, Shanghai General HospitalShanghai Jiao Tong University School of Medicine Shanghai China
3. Division of Gastroenterology and Hepatology, Shanghai Institute of Digestive Disease, Renji Hospital, School of MedicineShanghai Jiao Tong University Shanghai China
4. Department of GastroenterologyDrum Tower Hospital affiliated to the Medical School of Nanjing University Nanjing Jiangsu Province China
5. Department of Gastroenterology, Xijing HospitalFourth Military Medical University Xi'an Shaanxi Province China
6. Department of PathologyEmory University School of Medicine Atlanta GA