1. Department of Oncology; The Norwegian Radium Hospital; Oslo University Hospital; Oslo Norway
2. Department of Pediatric Oncology; Regina Margherita Children's Hospital; Turin Italy
3. Department of Oncology; Skåne University Hospital and Lund University; Lund Sweden
4. Department of Medical Oncology; S. Maria delle Croci Hospital; Ravenna Italy
5. Department of Oncology; Turku University Hospital; Turku Finland
6. Department of Orthopaedics; The Norwegian Radium Hospital; Oslo University Hospital; Oslo Norway
7. Department of Musculoskeletal Oncology; Division of Chemotherapy; Istituto Ortopedico Rizzoli; Bologna Italy