RT Journal Article SR Electronic T1 Abstracts JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 480 OP 502 DO 10.1136/ard.27.5.480 VO 27 IS 5 YR 1968 UL http://ard.bmj.com/content/27/5/480.abstract AB