1. Bone Tumour Reference Centre, Institute of PathologyUniversity Hospital Basel and University of Basel Basel Switzerland
2. Gerhard‐Domagk‐Institute of PathologyUniversity Hospital Münster Münster Germany
3. Histopathology DepartmentRoyal National Orthopaedic Hospital NHS Trust Stanmore UK
4. Division of Translational Pathology, Gerhard‐Domagk‐Institute of PathologyUniversity Hospital Münster Münster Germany
5. Department of Pediatric OncologyKlinikum Kassel Kassel Germany
6. Children's Cancer Research Centre and Department of Pediatrics, Klinikum rechts der IsarTechnische Universität München Munich Germany
7. Department of Orthopaedics and Tumour OrthopaedicsUniversity Hospital Münster Münster Germany
8. Department of Musculoskeletal Surgery, Sarcoma Centre EssenWestdeutsches Tumorzentrum Essen Germany
9. Paediatric Orthopaedic DepartmentUniversity Children's Hospital Basel Basel Switzerland
10. Department of RadiologyKlinikum Ibbenbüren Ibbenbüren Germany
11. Department of Pathology, UCL Cancer Institute London UK