¹Professor of Biostatistics, Director of Statistics, Cancer Research UK Clinical Trials Unit, School of Cancer Sciences and University of Birmingham

¹Wellcome Trust Sanger Institute, Hinxton, UK

¹EORTC, Brussels, Belgium

¹University College Hospital, London, UK,²Olgahospital, Klinikum Stuttgart, Stuttgart, Germany,³Stanford University School of Medicine, Palo Alto, CA, USA,⁴Oslo University Hospital, The Norwegian Radium Hospital, Scandinavian Sarcoma Group, Oslo, Norway,⁵Center for Clinical Trials, University of Münster,, Münster, Germany,⁶University Hospital of Münster, Münster, Germany,⁷Skane University Hospital and Lund University, Lund, Sweden,⁸Leiden University Medical Center, Leiden, The Netherlands,⁹The Children’s Hospital, Bronx, NY, USA,¹⁰MRC Clinical Trials Unit at UCL, London, UK,¹¹St Anna Children’s Hospital, Vienna, Austria,¹²Childrens Oncology Group, Arcadia, CA, USA,¹³University Children’s Hospital Basel, Basel, Switzerland,¹⁴Huntsman Cancer Inst, Salt Lake City, UT, USA,¹⁵Children’s Hospital Boston, Boston, MA, USA,¹⁶IWK Health Centre, Halifax, NS, Canada

¹University College London, London, UK,²University of Oxford, Oxford, UK,³Imperial College London, London, UK,⁴King’s College London, London, UK,⁵Great Ormond Street Hospital, London, UK