1. Biopathological Science, Okayama University Graduate School of Medicine and Dentistry, Okayama;
2. Department of Medicine and Biosystemic Science and
3. Center for Cellular and Molecular Medicine, Kyushu University Graduate School of Medical Science, Fukuoka; and
4. Department of Hematology/Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan