Department of Hematology and Clinical Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Japan. tcbn@kcch.jp. Kanagawa Cancer Center, 2-3-3 Nakao, Asahi-ku, Yokohama, 241-8515, Japan. tcbn@kcch.jp. Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan. Department of Hematology and Oncology, Tokai University School of Medicine, Isehara, Japan. Division of Clinical Oncology and Hematology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan. Department of Hematology, Yokohama City University Medical Center, Yokohama, Japan. Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Tokyo, Japan. Department of Hematology and Clinical Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Japan. Department of Hematology, Chiba University Hospital, Chiba, Japan. Department of Biomedical Statistics and Bioinformatics, Kyoto University Graduate School of Medicine, Kyoto, Japan. Kanagawa Cancer Center, 2-3-3 Nakao, Asahi-ku, Yokohama, 241-8515, Japan. Division of Hematology, Department of Medicine, Keio University School of Medicine, Tokyo, Japan.