1. Department of Orthopaedics, University of Bologna, Bologna, Italy
2. Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
3. The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Science (NDORMS), University of Oxford, UK
4. Moffitt Cancer Center & Research Institute, 12902 Magnolia Drive Tampa, FL 33612, USA