[1] Juntendo Univ, Sch Med, Dept Hematol, Tokyo 113, Japan
[2] Univ Tokyo, Inst Med Sci, Div Cellular Therapy, Tokyo, Japan
[3] Keio Univ, Sch Med, Dept Internal Med, Div Hematol, Tokyo, Japan
[4] Chiba Univ, Grad Sch Med, Dept Cellular & Mol Med, Chiba, Japan