1Department of Pathology, Sidra Medicine, Doha, Qatar
2Theodor- Boveri-Institute/Biocenter, Developmental Biochemistry, Wuerzburg University, Wuerzburg, Germany
3Comprehensive Cancer Center Mainfranken, Wuerzburg University, Wuerzburg, Germany
4Princess Maxima Centre for Pediatric Oncology, Utrecht, Netherlands
5Department of Diagnostic Pathology and Laboratory Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
6Sorbonne Université, Department of Pathology, Hopitaux Universitaires Est Parisien, Paris, France
7Department of Pathology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
8Molecular Bases of Genetic Risk and Genetic Testing Unit, Department of Preventive and Predictive Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
9Great Ormond Street Institute of Child Health, University College London, London, UK
10Kiel Paediatric Tumour Registry, Department of Paediatric Pathology, University Hospital of Kiel, Kiel, Germany
11Department of Paediatric Oncology & Haematology, Saarland University, Homburg, Germany