1. the incidence reported during the Third National Morbidity Survey, conducted in 1981-82, was 20% lower than that reported during the second survey completed 10 years earlier.16 In addition, the incidence of rheumatoid arthritis recorded between 1980 and;Britain, In
2. General Practitioners' Oral Contraception Study. Reduction in incidence of rheumatoid arthritis associated with oral contraceptives;of, Royal College;Lancet,1978
3. Oral contraceptives and rheumatoid arthritis: further evidence for a preventive effect;P, Vandenbroucke J.; A, Valkenburg H.; W, Boersma J.;Lancet,1982
4. Noncontraceptive hormones and rheumatoid arthritis in perimenopausal women;P, Vandenbroucke J.; M, Witteman J.C.; A, Valkenburg H.;JAMA,1986
5. The preventive effect of oral contraceptives on the incidence of rheumatoid arthritis;Hazes, M.; C, Dijkmans B.A.; P, Vandenbroucke J.; P, De Vries R.R.; Cats, A.;Clin Exp Rheumatol,1987