RT Journal Article SR Electronic T1 Abnormal IgA levels in patients with rheumatoid arthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 83 OP 84 DO 10.1136/ard.62.1.83 VO 62 IS 1 A1 L J Badcock A1 S Clarke A1 P W Jones A1 P T Dawes A1 D L Mattey YR 2003 UL http://ard.bmj.com/content/62/1/83.abstract AB