doi: 10.1136/ard.2009.107649 2009 2010 69: 618-623 originally published online February 5, Ann Rheum Dis Lode Melis, Bernard Vandooren, Elli Kruithof, et al. not spondyloarthritis with disease activity in rheumatoid arthritis but Systemic levels of IL-23 are strongly associated http://ard.bmj.com/content/69/3/618.full.html Updated information and services can be found at: These include: References http://ard.bmj.com/content/69/3/618.full.html#ref-list-1 This article cites 45 articles, 20 of which can be accessed free at: service Email alerting box at the top right corner of the online article. Receive free email alerts when new articles cite this article. Sign up in the Notes http://ard.bmj.com/cgi/reprintform To order reprints of this article go to: http://ard.bmj.com/subscriptions go to: Annals of the Rheumatic Diseases To subscribe to group.bmj.com on July 6, 2010 - Published by ard.bmj.com Downloaded from