1. Bone Marrow Transplantation Centre, University-Hospital Eppendorf, Hamburg, Germany; Internal Medicine IV (Haematology/Oncology), Martin-Luther-University Halle-Wittenberg, 06120 Halle/S., Germany
2. Bone Marrow Transplantation Centre, University-Hospital Eppendorf, Hamburg, Germany
3. Medical School Hannover, Hannover, Germany
4. University of Ulm, Germany
5. Huddinge University Hospital, Stockholm, Sweden