[1] Kobe Univ, Grad Sch Med, Dept Med, Div Hematol, Kobe, Hyogo 657, Japan
[2] Kobe Univ, Grad Sch Med, Dept Med, Div Cardiol, Kobe, Hyogo 657, Japan
[3] Kobe Univ Hosp, Diagnost Pathol, Kobe, Hyogo, Japan
[4] Kitasato Univ, Sch Med, Kitasato Inst Hosp, Dept Cardiol, Tokyo, Japan
[5] Nishiwaki Municipal Hosp, Dept Hematol, Nishiwaki, Japan