- Correspondence to Lilian N Nwosu, Department of Academic Rheumatology, Arthritis Research UK Pain Centre, University of Nottingham, City Hospital, Clinical Sciences Building, Hucknall Road, Nottingham NG5 1PB, UK;
- Received December 22, 2014
- Revised June 4, 2015
- Accepted July 13, 2015
- First published August 18, 2015.
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- Data supplement 1 - Online supplement
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