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    H Marotte et al.. “The shared epitope is a marker of severity associated with selection for, but not with response to, infliximab in a large rheumatoid arthritis population.” Annals of the rheumatic diseases, vol. 65, no. 3, 2006, pp. 342–347. http://access.bl.uk/ark:/81055/vdc_100135544542.0x000062