Genetic polymorphisms in PTPN22, PADI-4, and CTLA-4 and risk for rheumatoid arthritis in two longitudinal cohort studies: evidence of gene-environment interactions with heavy cigarette smoking
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* Corresponding author: Karen H Costenbader kcostenbader@partners.org
Arthritis Research & Therapy 2008, 10:R52 doi:10.1186/ar2421
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