1. Division of Gastroenterology, National Hospital Kyushu Medical Center, Fukuoka,
2. Department of Medicine and Bioregulatory Science and
3. Department of Medical Information Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka,
4. Division of Gastroenterology and Division of Hematology, National Hospital Kyushu Cancer Center, Fukuoka,
5. Department of Clinical Immunology, Institute of Bioregulation, Kyushu University, Beppu,
6. Blood Transfusion Service, Kyushu University Hospital, Fukuoka and
7. Fukuoka Red Cross Blood Center, Fukuoka, Japan