1. Department of Paediatric Surgery University Hospitals Bristol NHS Foundation Trust Bristol UK
2. Pediatric Surgery Unit, Department of Woman's and Child's Health University Hospital of Padova Padova Italy
3. Department of Paediatric Surgery Vall d'Hebron University Hospital Barcelona Spain
4. Department of Paediatric Surgery Bicêtre Hospital Hôpitaux Universitaires Paris‐Sud Le Kremlin‐Bicetre France
5. Department of Paediatric Surgery Prinses Máxima Centrum voor Kinderoncologie Utrecht The Netherlands
6. Department of Urology Great Ormond Street Hospital for Children NHS Foundation Trust London UK
7. Department of Paediatric Surgery Royal Manchester Children's Hospital Manchester UK
8. Department of Pediatric Oncology Children's Hospital for Wales Heath Park Cardiff UK
9. Department of Pediatric Histopathology Royal Manchester Children's Hospital Manchester UK
10. Hematology Oncology Division, Department of Women's and Children's Health University of Padova Padova Italy
11. Clinical Trials and Biostatistics Unit IRCCS Istituto Oncologico Veneto Padova Italy