1. Department of Oncology; Istituto Ortopedico Rizzoli; Bologna Italy
2. Department of Pediatric Oncology; Istituto Nazionale Tumori; Milano Italy
3. Department of Oncology; The Norwegian Radium Hospital; Oslo University Hospital; Oslo Norway
4. Department of Pediatric Oncology; Ospedale Regina Margherita; Torino Italy
5. Department of Pediatric Oncology; Ospedale S. Orsola Malpighi; Bologna Italy
6. Department of Pediatric Oncology; Ospedale A. Meyer; Firenze Italy
7. Department of Oncology; Ospedale S. Maria Delle Croci; Ravenna Italy
8. Department of Radiotherapy; Ospedale S. Orsola; Bologna Italy
9. Department of Oncology; SkÃne University Hospital; Lund Sweden
10. Department of Pediatrics; Ospedale di Ciriè; Torino Italy