1. 1Department of Pediatric Hematology and Oncology, IRCCS Ospedale Pediatrico Bambino Gesù Rome, Catholic University of the Sacred Heart, Rome, Italy
2. 2University of Tübingen, Tuebingen, Germany
3. 3BC Children's Hospital, University of British Columbia, Vancouver, Canada
4. 4University of Regensburg, Regensburg, Germany
5. 5Imperial College Healthcare NHS Trust, St Mary's Hospital, London, United Kingdom
6. 6The Hospital for Sick Children, Toronto, Canada
7. 7Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL
8. 8Heinrich-Heine-University, Duesseldorf, Germany
9. 9Herbert Irving Comprehensive Cancer Center, Columbia University, New York, NY
10. 10Stanford University School of Medicine, Stanford, CA
11. 11University of Milan, Milan, Italy
12. 12University of Athens, Kaisariani, Greece
13. 13Joan and Sanford I Weill Medical College of Cornell University, New York, NY
14. 14Vertex Pharmaceuticals Incorporated, Boston, MA
15. 15CRISPR Therapeutics, Cambridge, MA
16. 16Sarah Cannon Center Research Institute and The Children's Hospital at TriStar Centennial, Nashville, TN