1Laboratory of Immunogenetics, IME Foundation, Policlinic of University Tor Vergata, Rome, Italy, 2San Raffaele Institute for Gene Therapy (HSR-TIGET), San Raffaele Scientific Institute, Milan, Italy, 3HLA Tissue Typing Laboratory, San Raffaele Scientific Institute, Milan, Italy, 4Pediatric Research and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy, 5Hematology and Bone Marrow Transplantation Unit, Pediatric Research and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy, 6San Raffaele Institute for Gene Therapy (HSR-TIGET), Pediatric Research and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy, 7San Raffaele Institute for Gene Therapy (HSR-TIGET), HLA Tissue Typing Laboratory, San Raffaele Scientific Institute, Milan, Italy