1. Hospital Saint-Louis, Assistance Publique Hôpitaux de Paris, INSERM 1131, University Paris 7, Paris, France;
2. Team methods, Epidemiology and Statistics Sorbonne Paris Cité Research Centre, Unité Mixte de Recherche 1153, INSERM, Paris Descartes University, Paris, France;
3. Epidemiology Center, Assistance Publique Hôpitaux de Paris, Hôpital Hôtel-Dieu, Paris, France;
4. Division of Hematology/Oncology, Department of Internal Medicine, San Raffaele Hospital, Milan, Italy;
5. Department of Hematology, San Martino Hospital, Genoa, Italy;
6. Department of Hematology, Civil Hospital, Pescara, Italy;
7. Division of Hematology, Department of Internal Medicine, Dresden University Hospital, Dresden, Germany;
8. Department Hematology, Paoli Calmettes Institute, Marseille, France;
9. Hematologic Oncology and Bone Marrow Transplantation Unit, Anadolu Medical Center Hospital, Kocaeli, Turkey;
10. Division of Hematology/Oncology, Asturias Central University Hospital, Oviedo, Spain;
11. Department of Hematology, Lyon Sud Hospital, Lyon, France;
12. Division of Hematology and Clinical Immunology, Perugia University, Perugia, Italy;
13. European Group for Blood and Marrow Transplantation Data Office, Leiden, The Netherlands;
14. Department of Hematology, University Hospital Gasthuisberg, Leuven, Belgium;
15. Department of Internal Medicine, Hospital Santa Creu i Sant Pau, Barcelona, Spain;
16. A.Z. Sint-Jan, Brugge, Belgium;
17. Division of Hematology/Oncology, Department of Internal Medicine, University of Heidelberg, Heidelberg, Germany;
18. Department of Hematology, Gregorio Marañon General University Hospital, Madrid, Spain;
19. Department of Hematology/Immunology/Oncology, Universität Tübingen, Tübingen, Germany;
20. Department of Hematology, Hospital Reina Sofia Córdoba Hospital, Córdoba, Spain;
21. Department of Hematology and Oncology, University Hospital Leipzig, Leipzig, Germany;
22. Department of Hematology, First Affiliated Hospital, Zhejiang University, Hangzhou Zhejiang, China;
23. Department of Hematology, Netcare Pretoria East Hospital, Pretoria Gauteng, South Africa;
24. Department of Hematopoietic Diseases, Radboud University Medical Center, Nijmegen, The Netherlands;
25. Stem Cell Transplant Unit, Medical Park Hospitals, Antalya, Turkey; and
26. Department of Hematology/Oncology, University Hospital Eppendorf, Hamburg, Germany