[1] Kobe Univ Hosp, Div Blood Transfus, Chuo Ku, Kobe, Hyogo 6500017, Japan
[2] Kagawa Med Univ Hosp, Dept Transfus Med, Kagawa, Japan
[3] Kobe Kyodo Hosp, Sect Internal Med, Kobe, Hyogo, Japan
[4] Kobe Univ, Sch Med, Div Hematol, Kobe, Hyogo 650, Japan
[5] Kobe Univ, Sch Med, Fac Hlth Sci, Kobe, Hyogo 650, Japan