1. Department of Histopathology; Royal National Orthopaedic Hospital NHS Trust; Stanmore UK
2. UCL Cancer Institute, Huntley Street; London UK
3. Department of Anatomical Pathology; A. C. Camargo Cancer Centre; Sao Paulo Brazil
4. Department of Radiology; Royal National Orthopaedic Hospital NHS Trust; Stanmore UK
5. Bone Tumour Reference Centre at the Institute of Pathology; University Hospital Basel; Basel Switzerland