1. Institute of Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service, Baden Wuerttemberg-Hessen, Ulm, and University Hospital Ulm, Ulm, Germany;
2. Institute of Transfusion Medicine, University of Ulm, Ulm, Germany;
3. Department of Hematology/Oncology, University of Leipzig, Leipzig, Germany;
4. Department of Internal Medicine III, University of Ulm, Ulm, Germany;
5. Division of Stem Cell Transplantation and Immunotherapy, 2nd Department of Medicine, University of Kiel, Kiel, Germany;
6. Department of Medicine III, Johannes Gutenberg-University Mainz, Mainz, Germany;
7. Department of Hematology/Oncology, Georg-August-University Göttingen, Göttingen, Germany;
8. Department of Hematology/Oncology, Asklepios Klinik St. Georg Hamburg, Hamburg, Germany;
9. Department Internal Medicine I, Universitätsklinikum des Saarlandes, Homburg, Germany;
10. Department of Internal Medicine II, University Hospital Würzburg, Würzburg, Germany;
11. Hematology/Oncology Department, Charité Campus Virchow Berlin, Berlin, Germany;
12. Centre for Bone Marrow and Blood Stem Cell Transplantation, Deutsche Klinik für Diagnostik, Wiesbaden, Germany;
13. Medical Clinic 5: Hematology, Oncology, Nuremberg Hospital, Nuremberg, Germany;
14. Department of Medicine III, Hematology/Oncology/Palliative Care, Rostock University Medical Center, Rostock, Germany;
15. Division of Hematology and Oncology, Oldenburg Clinic, University of Rostock, Oldenburg, Germany;
16. 2nd Department of Internal Medicine, Oncology and Hematology, Robert Bosch Hospital Stuttgart, Stuttgart, Germany;
17. Hematology/Oncology, Evangelic Clinic Essen-Werden, Essen-Werden, Germany;
18. Hematology/Oncology, Klinikum Bremen-Mitte, Bremen, Germany;
19. Universitätsmedizin Mannheim, Med. Klinik III, Mannheim, Germany;
20. Medizinische Klinik III, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany;
21. Zentrales Knochenmarkspender-Register für Deutschland, German National Bone Marrow Donor Registry, Ulm, Germany; and
22. German Registry for Stem Cell Transplantation, Ulm, Germany