1. Institut Gustave Roussy, Pediatric Department, Villejuif, France;
2. Institut Gustave Roussy, Biostatistics and Epidemiology Department, Villejuif, France;
3. Sheffield Children's Hospital, Sheffield, United Kingdom;
4. Institut Curie, Pediatric Department, Paris, France;
5. Royal Marsden Hospital, Sutton, Surrey, United Kingdom;
6. Keck School of Medicine, University of Southern California, Los Angeles, CA;
7. University of Leicester, Leicester, United Kingdom;
8. Centre Hospitalier Universitaire (CHU) Bicêtre Assistance Publique–Hôpitaux de Paris (AP-HP), University Paris Sud 11, France;
9. University of Utah Health Sciences Center, Salt Lake City, UT;
10. Gloucestershire Hospitals, National Health Service (NHS) Foundation Gloucestershire, United Kingdom;
11. Morgan Stanley Children's Hospital of New York-Presbyterian, Columbia University, New York, NY;