RT Journal Article SR Electronic T1 The window of opportunity in ACPA-positive rheumatoid arthritis is not explained by ACPA characteristics JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 1697 OP 1698 DO 10.1136/ard.2010.148312 VO 70 IS 9 A1 Annemiek Willemze A1 Michael P M van der Linden A1 Saskia le Cessie A1 Leendert A Trouw A1 Rene E M Toes A1 Tom W J Huizinga A1 Annette H M van der Helm-van Mil YR 2011 UL http://ard.bmj.com/content/70/9/1697.abstract AB