- Correspondence to Professor B Paul Wordsworth, NIHR Oxford Musculoskeletal Biomedical Research Unit, Botnar Research Centre, Nuffield Orthopaedic Centre, Windmill Road, Headington, Oxford OX3 7LD, UK;
- Received February 20, 2015
- Accepted August 19, 2015
- First published October 9, 2015.
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- Data supplement 1 - Online supplement
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