1. Department of Orthopaedic Surgery, Leiden University Medical Centre, Leiden, the Netherlands
2. School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
3. Orthopaedic Surgery Department, Royal Melbourne Hospital, Melbourne, Australia
4. Physiotherapy Department, The Alfred, Melbourne, Australia
5. Department of Surgery, The University of Melbourne, Melbourne, Australia
6. Orthopaedic Surgery Department, The Alfred, Melbourne, Australia
7. Health Data Research UK, Swansea University Medical School, Swansea, UK