1. Faculty of Engineering and Physical Sciences, University of Southampton, University Road, Southampton SO17 1BJ, United Kingdom
2. Department of Engineering Science, University of Oxford, Old Road, Headington, Oxford OX3 7LD, U.K.
3. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Old Road, Headington, Oxford OX3 7LD, United Kingdom