1. Bone Tumour Reference Center at the Institute of PathologyUniversity and University Hospital Basel Basel Switzerland
2. Department of Laboratory Medicine, Division of Clinical GeneticsLund University Lund Sweden
3. Coordinator INFORM Program, Hopp Children's Cancer Center, German Cancer Research Center, University Hospital Heidelberg Heidelberg Germany
4. Cooperative Osteosarcoma Study Group, Stuttgart Cancer Center, Klinikum Stuttgart – Olgahospital, Pediatrics 5 (Oncology, Hematology, Immunology) Stuttgart Germany
5. Department of Pediatrics, Pediatric Oncology CenterTechnische Universität München Munich Germany
6. Pediatric Hematology and OncologyKlinikum Kassel Kassel Germany