RT Journal Article SR Electronic T1 Rheumatoid Factor, Smoking, and Disease Severity: Associations with Mortality in Rheumatoid Arthritis JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 945 OP 949 VO 35 IS 6 A1 NICOLA J. GOODSON A1 TRACEY M. FARRAGHER A1 DEBORAH P.M. SYMMONS YR 2008 UL http://www.jrheum.org/content/35/6/945.abstract AB