RT Journal Article SR Electronic T1 Rheumatoid factors: what do they tell us? JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2034 OP 2040 VO 29 IS 10 A1 Marianna M Newkirk YR 2002 UL http://www.jrheum.org/content/29/10/2034.abstract AB