- Correspondence to Dr Philip G Conaghan, Leeds Institute of Rheumatic and Musculoskeletal Medicine, Chapel Allerton Hospital, Chapeltown Road, Leeds LS7 4SA, UK;
- Received July 17, 2015
- Revised December 1, 2015
- Accepted December 31, 2015
- First published January 25, 2016.
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- Data supplement 1 - Online supplement
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