[1] Karolinska Univ Hosp, Div Hematol, Dept Med, Stockholm, Sweden
[2] Karolinska Inst, Stockholm, Sweden
[3] NCI, NIH, Bethesda, MD 20892 USA
[4] Sahlgrens Univ Hosp, Dept Med, Sect Hematol & Coagulat, Gothenburg, Sweden
[5] Umea Univ Hosp, S-90185 Umea, Sweden
[6] Malmo Univ Hosp, Dept Med, Malmo, Sweden