RT Journal Article SR Electronic T1 Use of biologics in a patient with rheumatoid arthritis refractory to methotrexate JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 793 OP 795 DO 10.1503/cmaj.121607 VO 185 IS 9 A1 Jasvinder A. Singh YR 2013 UL http://www.cmaj.ca/content/185/9/793.abstract AB