By C. Mel Wilcox, MD, Professor of Medicine, Division of Gastroenterology and Hepatology, University of Alabama at Birmingham, Birmingham, AL, USA; Miguel Munoz-Navas, Professor of Medicine, Director of Gastroenterology Division and Endoscopy Unit, Division of Gastroenterology, University Hospital of Navarra, Pamplona, Spain; and Joseph Jy Sung, Professor, Chief of Gastroenterology and Hepatology, Department of Medicine and Therapeutics, Prince of Wales Hospital; The Chinese University of Hong Kong |