Disparities in rheumatoid arthritis disease activity according to gross domestic product in 25 countries in the QUEST-RA database.
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Ann Rheum Dis. 2009 Nov;68(11):1666-72. doi: 10.1136/ard.2009.109983. Epub 2009 Jul 30.
Ann Rheum Dis. 2009.
PMID: 19643759
Free PMC article.