1. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
2. Great Ormond Street Hospital for Children London UK
3. Paediatric Haemato‐oncology Hospital Santa Casa de Belo Horizonte Belo Horizonte Brazil
4. Department of Paediatric Oncology & Haematology La Timone Children's Hospital Marseille France
5. Grupo Brasileiro de Tumores Renais (Brazilian Renal Tumor Group) São Paulo Brazil
6. Department of Research Netherlands Comprehensive Cancer Organisation (IKNL) Utrecht The Netherlands
7. Department of Medical Oncology and Hematology, Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale dei Tumori di Milan Milan Italy
8. Department of Paediatric Oncology Hospital Universitario Virgen del Rocío Seville Spain
9. Department of Paediatric Oncology & Haematology Saarland University Homburg Germany
10. UCL Great Ormond Street Institute of Child Health, University College London London UK
11. Division of Child Health, Wilhelmina Children's Hospital University Medical Center Utrecht The Netherlands