1. Bay-area Lymphoma Information Network, Tokyo, Japan;
2. Division of Hematology and Oncology, Department of Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Japan;
3. Department of Hematology and Clinical Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Japan;
4. Department of Hematology and Medical Oncology, Cancer Institute Hospital, Tokyo, Japan;
5. Ganken Ariake Lymphoma Study Group, Tokyo, Japan;
6. Department of Medical Oncology, Kanagawa Cancer Center, Yokohama, Japan;
7. Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan;
8. Department of Hematology and Immunology, Kanazawa Medical University, Kanazawa, Japan;
9. Division of Hematology, Tochigi Cancer Center, Utsunomiya, Japan;
10. Department of Hematology, Gunma Cancer Center, Ota, Japan;
11. Division of Hematology, Department of Internal Medicine, National Tokyo Medical Center, National Hospital Organization, Tokyo, Japan;
12. Department of Chemotherapy, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Tokyo, Japan;
13. Department of Hematology/Oncology, Tokai University School of Medicine, Isehara, Japan;
14. Department of Medicine, Division of Medical Oncology, Hematology, and Infectious Diseases, School of Medicine, Fukuoka University, Fukuoka, Japan;
15. Division of Hematology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan;
16. Department of Hematology, National Hospital Organization, Okayama Medical Center, Okayama, Japan;
17. Department of Hematology and Oncology, Osaka University Graduate School of Medicine, Suita, Japan;
18. Fourth Department of Internal Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan;
19. Department of Hematology, Yokohama City University Medical Center, Yokohama, Japan;
20. Department of Hematology and Rheumatology, Nihon University School of Medicine, Tokyo, Japan;
21. Department of Internal Medicine, Sasebo City General Hospital, Sasebo, Japan;
22. Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan;
23. Department of Hematology, Tokyo Medical and Dental University, Tokyo, Japan;
24. Department of Hematology/Immunology, Fujisawa City Hospital, Fujisawa, Japan;
25. Pathology Project for Molecular Targets, Cancer Institute Japanese Foundation for Cancer Research, Tokyo, Japan