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Nikiphorou E, Carpenter L, Morris S, et al. "Hand and foot surgery rates in rheumatoid arthritis have declined from 1986 to 2011, but large-joint replacement rates remain unchanged: results from two UK inception cohorts." Arthritis Rheumatol. 2014;66(5):1081-9. doi:10.1002/art.38344. PMID24782174