1. Department of Hematology, Kanagawa Cancer Center, Yokohama, Japan
2. Division of Hematology, Shonan Kamakura General Hospital, Kamakura, Japan
3. Department of Hematology, Kitasato University School of Medicine, Sagamihara, Japan
4. Department of Hematology and Clinical Immunology, Yokohama City University School of Medicine, Yokohama, Japan