1 Department of Radiation Oncology, Ghent University Hospital, Ghent, Belgium.
2 Radiotherapy Department, University College London Hospitals NHS Foundation Trust, London, UK.
3 Department of Radiation Oncology, University Hospital Heidelberg, Heidelberg, Germany.
4 Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, Netherlands; Princess Máxima Center for Paediatric Oncology, Utrecht, Netherlands.
5 Department of Radiotherapy, University Institute of Cancer Toulouse-Oncopôle, Toulouse, France.
6 Manchester Academic Health Science Centre, The Christie NHS Foundation Trust and The Children's Brain Tumour Research Network, Royal Manchester Children's Hospital, University of Manchester, Manchester, UK.
7 Department of Oncology, University College London Hospitals NHS Foundation Trust, London NW1 2PG, UK. Electronic address: mgaze@nhs.net.