1. Department of Oncology, Helios Klinikum Berlin-Buch, Berlin, Germany
2. Department of Paediatric Onco-Haematology, Trousseau Hospital, Paris, France
3. Department of Pediatric Hematology & Oncology, Hospital Sant Joan de Déu, Barcelona, Spain
4. Oncology Department, Birmingham Children's Hospital NHS Foundation Trust, Birmingham, UK
5. Division of Clinical Studies, Institute of Cancer Research & Sarcoma Unit of the Royal Marsden NHS Foundation Trust, London, UK