1. Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan and Department of Surgery I, Hokkaido University School of Medicine, Sapporo 060-8638, Japan
2. Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan
3. Institute of Medical Science, Tokyo University, Tokyo 108-8639, Japan
4. Department of Surgery I, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan
5. Department of Surgery I, Hokkaido University School of Medicine, Sapporo 060-8638, Japan