1. Max-Eder Research Group for Pediatric Sarcoma Biology, Institute of Pathology, Faculty of Medicine, LMU Munich, Munich, Germany
2. Department of Pathology, Medical Faculty, Ankara Yildirim Beyazit University, Ankara, Turkey
3. Department of Pathology, Turgut Ozal Medical Center, Inonu University, Malatya, Turkey
4. Department of Pathology, Başkent University Hospital, Ankara, Turkey
5. Department of Pediatric Hematology and Oncology, University Hospital Essen, Essen, Germany
6. Gerhard-Domagk-Institute for Pathology, University Hospital Münster, Westfalian Wilhelms University, Münster, Germany
7. Institute of Biomedicine of Seville (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, CIBERONC, Seville, Spain
8. Bone Tumour Reference Center, Institute of Pathology, University Hospital Basel, University of Basel, Basel, Switzerland
9. Institute of Pathology, Faculty of Medicine, LMU Munich, Munich, Germany
10. German Cancer Consortium (DKTK), Heidelberg, Germany
11. German Cancer Research Center (DKFZ), Heidelberg, Germany