1. Department of Lymphoid Cancer Research; British Columbia Cancer Research Centre; Vancouver Canada
2. Department of Pathology; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan
3. Department of Gastroenterology and Hepatology; Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences; Okayama Japan
4. Department of Internal Medicine; Hiroshima Red Cross Hospital and Atomic-bomb Survivors Hospital; Hiroshima Japan