- Correspondence to Dr Sarah Louise Mackie, Division of Rheumatic and Musculoskeletal Disease, NIHR-Leeds Musculoskeletal Research Unit, Chapel Allerton Hospital, University of Leeds, Leeds LS7 4SA, UK;
- Received August 15, 2012
- Revised November 22, 2012
- Accepted December 23, 2012
- First published January 25, 2013.
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