Department of Gastroenterology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China. Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases and Surgery Institute, Cleveland Clinic, Cleveland, Ohio. Department of Gastroenterology, The Affiliated Hospital of Qingdao University, Qingdao, China. Department of Gastroenterology, The Alfred Hospital, Melbourne, Victoria, Australia. Department of Gastroenterology, Sheba Medical Center, Tel Hashomer, Israel. Department of Gastroenterology, University Hospital of Saint Etienne, Saint Etienne, France.