Shinsuke Iida1, Chihiro Shimazaki2, Masahiro Abe3, Chiaki Nakaseko4. 1. Department of Hematology and Oncology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan. iida@med.nagoya-cu.ac.jp. 2. Japan Community Health Care Organization Kyoto Kuramaguchi Medical Center, 27 Koyamashimofusa-cho, Kita-ku, Kyoto-shi, Kyoto, 603-8151, Japan. 3. Department of Hematology, Endocrinology, and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15, Kuramoto-cho, Tokushima, 770-8503, Japan. 4. Department of Hematology, School of Medicine, International University of Health and Welfare, 4-3, Kozunomori, Narita, Chiba, 286-8686, Japan.