[1] Kantonsspital Basel, Div Haematol, CH-4031 Basel, Switzerland
[2] Kantonsspital Basel, Dept Internal Med, CH-4031 Basel, Switzerland
[3] Kantonsspital Basel, Dept Res, CH-4031 Basel, Switzerland
[4] European grp Blood & Marrow Transplantat, EBMT Secretariat, Barcelona, Spain