1. JIMRO, Otsuka Group; Takasaki Japan
2. Department of Gastroenterology; Akitsu Prefectural Hospital; Hiroshima Japan
3. Inflammatory Bowel Disease Centre, Yokkaichi Hazu Medical Centre; Yokkaichi Japan
4. Evangelisches Krankenhaus Kalk; Cologen University; Cologne Germany
5. Department of Gastroenterology; Pisa University Hospital; Pisa Italy