1. Department of Imaging, Royal Orthopaedic Hospital, Birmingham, United Kingdom
2. Department of Imaging, Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry, United Kingdom
3. Department of Imaging, Technische Universitat Munchen, Munich, Germany
4. Department of Imaging, Leiden University Medical Center, Leiden, The Netherlands
5. Department of Immunology, Genetics and Pathology (Oncology) and Department of Surgical Sciences (Radiology), Uppsala University Hospital, Uppsala, Sweden