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Common polymorphisms in the folate pathway predict efficacy of combination regimens containing methotrexate and sulfasalazine in early rheumatoid arthritis. Heather M James, David Gillis, Pravin Hissaria, Susan Lester, Andrew A Somogyi, Leslie G Cleland, and Susanna M Proudman. J Rheumatol April 2008 35(4):562-571