1. Division of Gastroenterology and Hepatology, Key Laboratory of Gastroenterology and Hepatology, Ministry of Health, Renji Hospital, School of Medicine, Shanghai Jiao Tong UniversityShanghai Institute of Digestive DiseaseShanghaiChina
2. Department of Digestive Endoscopy, Provincial Clinic Medical College, Fujian Medical UniversityFujian Provincial HospitalFuzhouChina