1. Department of Gastroenterology, Changhai Hospital; Second Military Medical University/Naval Medical University; Shanghai China
2. Department of Gastroenterology; Zhongnan Hospital of Wuhan University; Wuhan China
3. Hubei Clinical Center and Key Laboratory of Intestinal and Colorectal Diseases; Wuhan China
4. Digestive Endoscopy Center, Changhai Hospital; Second Military Medical University/Naval Medical University; Shanghai China
5. Department of Gastroenterology, The Second Clinical Medical College; Jinan University; Shenzhen China
6. Division of Digestive Diseases; Emory University School of Medicine; Atlanta Georgia USA
7. National Clinical Research Center of Digestive Diseases; Shanghai China