1. Institute of Pathology, University Ulm, 89081 Ulm, Germany
2. Gerhard-Domagk-Institute of Pathology, University Hospital Münster, 48149 Münster, Germany
3. Institute of Pathology and Experimental Cancer Research, Semmelweis University, 1085 Budapest, Hungary
4. Clinic for Trauma, Hand, Plastic and Reconstructive Surgery, University Hospital Ulm, 89081 Ulm, Germany
5. Institute of Pathology, University Hospital Carl Gustav Carus, 01307 Dresden, Germany
6. Centre for Orthopedics, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus, 01307 Dresden, Germany
7. Institute of Pathology, Technical University of Munich, 81675 Munich, Germany
8. Institute of Orthopedics, Semmelweis University, 1085 Budapest, Hungary
9. Bone Tumor Reference Centre at the Institute of Pathology, University Hospital Basel and University of Basel, 4003 Basel, Switzerland