1. MD; Pediatric and Adolescent Oncology; Gustave Roussy 114 Rue Eduard Vaillant 94805 Villejuif France
2. MD; Royal Marsden Fulham Road; SW3 6JJ, London UK
3. Biostatistics Department; Institut Gustave Roussy; Paris-Sud University; 114 Rue Eduard Vaillant 94805 Villejuif France
4. Pediatric Onco-Hematology Institute; Centre Léon Bérard; 28 Rue Laennec 69008 Lyon France
5. Department of Medical Oncology; Centre Léon Bérard; 28 Rue Laennec 69008 Lyon France
6. Department of Medical Oncology; Institut Bergonie; 229 cours de l'Argonne 33076 Bordeaux Cedex France
7. University College Hospital London NHS Foundation Trust; 1st Floor Central 250 Euston Road London NW1 2PG UK