RT Journal Article SR Electronic T1 Correction JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 1270 OP 1270 DO 10.1136/annrheumdis-2012-201469corr1 VO 72 IS 7 YR 2013 UL http://ard.bmj.com/content/72/7/1270.abstract AB