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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.
Costenbader KH, Chang SC, De Vivo I, Plenge R, Karlson EW
Arthritis Res Ther 2008, 10:R52
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