Rheumatoid factor seropositivity is inversely associated with oral contraceptive use in women without rheumatoid arthritis.
Bhatia SS, Majka DS, Kittelson JM, Parrish LA, Ferucci ED, Deane KD, Arend WP, Rewers M, Michael Holers V, Norris JM. Rheumatoid factor seropositivity is inversely associated with oral contraceptive use in women without rheumatoid arthritis. Ann Rheum Dis. 2007 Feb; 66(2):267-9.