RT Journal Article SR Electronic T1 Methotrexate effect on anti-cyclic citrullinated peptide antibody levels in rheumatoid arthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 1241 OP 1242 DO 10.1136/ard.2004.032136 VO 64 IS 8 A1 A Spadaro A1 V Riccieri YR 2005 UL http://ard.bmj.com/content/64/8/1241.abstract AB