1. Department of Stem Cell Transplantation; University Cancer Centre Hamburg; Hamburg; Germany
2. Department of Haematology/Oncology; University Hospital Regensburg; Regensburg; Germany
3. Department of Haematology/Oncology; University Hospital Dresden; Dresden; Germany
4. Department of Haematology/Oncology; University Hospital Düsseldorf; Düsseldorf; Germany
5. Department of Haematology and Stem Cell Transplantation; Institute of Haematology; Tel Hashomer; Israel
6. Department of Haematology/Oncology; Hannover Medical School; Hannover; Germany