1. Institute of Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service, Baden Wuerttemberg–Hessen, and
2. Institute of Transfusion Medicine, University of Ulm, Ulm, Germany;
3. Zentrales Knochenmarkspender-Register für Deutschland, Ulm, Germany;
4. Deutsches Register für Stammzelltransplantationen (DRST), Ulm, Germany;
5. Department of Hematology/Oncology, University of Leipzig, Leipzig, Germany;
6. Department of Internal Medicine III, University of Ulm, Ulm, Germany;
7. Department of Medicine III, Johannes Gutenberg-University Mainz, Mainz, Germany;
8. Division of Stem Cell Transplantation and Immunotherapy, 2nd Department of Medicine, University of Kiel, Kiel, Germany;
9. Centre for Bone Marrow and Blood Stem Cell Transplantation, Deutsche Klinik für Diagnostik, Wiesbaden, Germany;
10. Hematology/Oncology Department, Charité Campus Virchow Berlin, Berlin, Germany;
11. Department of Medicine II, University Hospital Würzburg, Würzburg, Germany;
12. Department of Hematology/Oncology, Georg-August-University Göttingen, Göttingen, Germany;
13. Department Internal Medicine I, Universitätsklinikum des Saarlandes, Homburg, Germany; and
14. Department of Hematology/Oncology, Asklepios Klinik St. Georg, Hamburg, Germany