- Correspondence to Dr Philip S Helliwell, Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, 2nd Floor, Chapel Allerton Hospital, Harehills Lane, Leeds LS7 4SA, UK;
- Received September 17, 2015
- Revised October 27, 2015
- Accepted November 17, 2015
- First published December 15, 2015.
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