- Correspondence to Professor Patrick J Venables, Nuffield Department of Orthopaedics, Kennedy Institute of Rheumatology, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7FY, UK;
- Received March 25, 2015
- Revised May 21, 2015
- Accepted July 6, 2015
- First published July 24, 2015.
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- Data supplement 1 - Online supplement
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