Medical Center for Digestive Diseases The Second Affiliated Hospital of Nanjing Medical University Nanjing Jiangsu 210011 China;
National Clinical Research Center for Digestive Diseases Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China;
Department of Gastroenterology Peking Union Medical College Hospital Beijing 100730 China;
National Clinical Research Center for Digestive Diseases Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China;
Department of Gastroenterology The First Affiliated Hospital of Guangdong Pharmaceutical University Guangzhou Guangdong 510080 China;
Department of Gastroenterology Shanghai General Hospital Shanghai Jiao Tong University School of Medicine Shanghai 201620 China;
Department of Gastroenterology and Hepatology Zhongshan Hospital Fudan University Shanghai 200032 China;