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. 2015 Mar 4;2(1):e000075. doi: 10.1136/lupus-2014-000075

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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British Isles Lupus Assessment Group (BILAG, musculoskeletal analogue) vs Rapid Evaluation of Activity in Lupus (REAL). Spearman rank correlation coefficient=0.925 (p<0.001).