RT Journal Article SR Electronic T1 Secondary addition of methotrexate to partial responders to etanercept alone is effective in severe rheumatoid arthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 209 OP 210 DO 10.1136/ard.2003.013532 VO 63 IS 2 A1 Cohen, J D A1 Zaltni, S A1 Kaiser, M J A1 Bozonnat, M C A1 Jorgensen, C A1 Daurès, J P A1 Sany, J YR 2004 UL http://ard.bmj.com/content/63/2/209.abstract AB