RT Journal Article SR Electronic T1 Comparison of the Effect of Plasmapheresis and Penicillamine on the Level of Circulating Rheumatoid Factor JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 71 OP 76 DO 10.1136/ard.22.2.71 VO 22 IS 2 A1 Israeli A. Jaffe YR 1963 UL http://ard.bmj.com/content/22/2/71.abstract AB