University of Pennsylvania, UCSF Benioff Children’s Hospital Oakland - Children’s Hospital Oakland Research Institute, Mahidol University - Division of Pediatric Hematology-Oncology, "G. Papanikolaou” General Hospital of Thessaloniki, University of Heidelberg, University of Heidelberg, Hannover Medical School, Great Ormond Street Hospital, Aix-Marseille University - Hôpital de la Timone, University of California, San Francisco (UCSF), Bluebird Bio Inc, Bluebird Bio Inc, Bluebird Bio Inc, Bluebird Bio Inc, Bluebird Bio Inc, Bluebird Bio Inc, Bluebird Bio Inc, Bambino Gesù Children's Hospital - Department of Pediatric Hematology and Oncology and University of Pennsylvania