Yuki Miyasako1, Toshio Kuwai1, Sauid Ishaq2,3. 1. Department of Gastroenterology, National Hospital Organization, Kure Medical Center and Chugoku Cancer Center, Hiroshima, Japan. 2. Gastroenterology Department, Dudley Group Hospitals, Birmingham City University, Birmingham, UK. 3. St George's University, Grenada, West Indies.