1. Cancer Research UK Trials UnitUniversity of Birmingham Birmingham UK
2. Leicester Cancer Research CentreUniversity of Leicester Leicester UK
3. Department of Pediatric Oncology and Hematology, Children's HospitalUniversity of Cologne Cologne Germany
4. St. Anna Children's Hospital Vienna Austria
5. Dana‐Farber/Boston Children's Cancer and Blood Disorders CenterHarvard Medical School Boston Massachusetts
6. Section of PaediatricsInstitute of Cancer Research and Royal Marsden Hospital Surrey UK
7. Department of PediatricsThe University of Chicago Chicago Illinois