RT Journal Article SR Electronic T1 Introduction JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2557 OP 2558 DO 10.3899/jrheum.090763 VO 36 IS 11 A1 DUNCAN A. GORDON YR 2009 UL http://www.jrheum.org/content/36/11/2557.abstract AB