1. Department of Hematology/Oncology, Tokai University School of Medicine, Isehara, Kanagawa, Japan;
2. Department of Laboratory Medicine, Tokai University School of Medicine, Isehara, Kanagawa, Japan;
3. Department of Laboratory Medicine, National Cancer Center Hospital, Tokyo, Japan;
4. Department of Hematology, Atsugi Sato Hospital, Atsugi, Kanagawa, Japan;
5. Department of Pathology, Tokai University School of Medicine, Isehara, Kanagawa, Japan