RT Journal Article SR Electronic T1 Ralph Consden JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 213 OP 213 DO 10.1136/ard.40.2.213 VO 40 IS 2 A1 L. E. G. YR 1981 UL http://ard.bmj.com/content/40/2/213.abstract AB