1. Department of Hematology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo, Japan,
2. Division of Stem Cell Therapy, Distinguished Professor Unit, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, Japan,
3. Department of Pathology, School of Medicine, Kurume University, Asahimachi 67, Kurume City, Fukuoka, Japan