1. Department Medicine V, University of Heidelberg, Heidelberg, Germany;
2. Department Medicine I, University of Dresden, Dresden, Germany;
3. German Bone Marrow Donor Registry, Tübingen, Germany;
4. Department of Hematology, Rigshospitalet, Copenhagen, Denmark;
5. Department Hematology and Pediatric Onco-Hematology, Istituto Nazionale dei Tumori, Milan, Italy;
6. Department Internal Medicine/Hematology, Maastricht University, Maastricht, The Netherlands;
7. Barts Cancer Institute, Queen Mary University of London, London, United Kingdom;
8. Department of Medicine/Hematology Unit, Karolinska Institute, Huddinge, Sweden;
9. Service d’Hématologie, Centre Hospitalier Lyon-Sud, Lyon, France;
10. Hospital de la Santa Creu Sant Pau, Barcelona, Spain;
11. Department Medicine III, University of Ulm, Ulm, Germany; and
12. Department of Hematology, Hospital Clínic, University of Barcelona, Barcelona, Spain