1. Department of Hematology and Bone Marrow Transplantation, Saint Savvas Regional Cancer Hospital, Athens, Greece;
2. Department of Immunology and Histocompatibility, “Evangelismos” General Hospital, Athens, Greece;
3. Department of Microbiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece;
4. Hematology Division, 2nd Department of Internal Medicine, “ATTIKO” General University Hospital, National and Kapodistrian University of Athens, Athens, Greece;
5. Department of Hematology and Bone Marrow Transplantation, Laikon General Hospital, National and Kapodistrian University of Athens, Athens, Greece;
6. Institute of Immunity and Transplantation Centre for Cell, Gene & Tissue Therapeutics, Royal Free Hospital, London, UK