1. Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
2. Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
3. Department of Gastrointestinal Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
4. Mikuri Immunology Laboratory Inc., Osaka, Japan
5. Sanyo Chemical Industries Ltd., Kyoto, Japan