1. Hematology and Bone Marrow Transplantation Unit, Department of Oncology, San Raffaele Scientific Institute, Milano, Italy;
2. Biostatistics Unit, Department of Health Sciences, University of Genova, Genova;
3. Immunogenetics Laboratory, Unit of Immunohematology and Blood Transfusion, Division of Regenerative Medicine and Stem Cell Therapy, San Raffaele Scientific Institute, Milano;
4. San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine and Stem Cell Therapy, San Raffaele Scientific Institute, Milano;
5. Division of Hematology, Ospedale San Martino, Genova;
6. Italian Bone Marrow Donor Registry, Ospedale Galliera, Genova;
7. Division of Hematology and Bone Marrow Transplantation, University of Udine, Udine;
8. Immunogenetics Laboratory, Ospedale San Martino, Genova;
9. Tissue Typing Laboratory, Azienda Ospedaliera S. M. Misericordia, Udine;
10. Institute of Hematology L. & A. Seragnoli, University of Bologna, Bologna; and
11. Department of Hematology, University of Florence, Florence, Italy