1. Department of Medical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
2. Department of Tumor Immunology, Radboud Institute of Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
3. Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
4. Dermatopathology Bodensee, Friedrichshafen, Germany
5. Department of Pathology, Academic Medical Center, Amsterdam, The Netherlands
6. Department of Pediatric Oncology, Emma Children’s Hospital-Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
7. Sarcoma Molecular Pathology Team, Divisions of Molecular Pathology and Cancer Therapeutics, Institute of Cancer Research, London, United Kingdom
8. The Institute of Cancer Research and The Royal Marsden NHS Foundation Trust, London, United Kingdom
9. Department of Pathology, Radboud University Medical Center, Nijmegen, The Netherlands