1 Department of Pediatric Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy. Electronic address: pietro.merli@opbg.net.
2 Children's University Hospital, Eberhard Karls University Tübingen, Tübingen, Germany.
3 Department of Pediatric Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
4 Department of Pediatric Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy; Sapienza, University of Rome, Rome, Italy.