1 Department of Hematology and Oncology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
2 Department of Medical Technology, Okayama University Graduate School of Health Sciences, Okayama, Japan.
3 Department of Hematology and Oncology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. k-matsu@md.okayama-u.ac.jp.