RT Journal Article SR Electronic T1 Diphenylamine Reaction in Rheumatoid Arthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 226 OP 231 DO 10.1136/ard.14.3.226 VO 14 IS 3 A1 Fearnley, G. R. A1 Pirkis, Jeanette A1 De Coek, Nanette A1 Lackner, Rita A1 Meanock, R. I. YR 1955 UL http://ard.bmj.com/content/14/3/226.abstract AB