1. All cases notified in 1990 were included in this family study and, for the purpose of analysis, were subdivided into those who satisfied the 1987 American Rheumatism Association (ARA) criteria for RA'5 at first visit or at the first annual follow up, or both, and those who did not satisfy the criteria on either occasion. Cases with another diagnosis, made by a hospital consultant, were excluded
2. Rheumatoid arthritis-nature or nurture?;S, Lawrence J.;Ann Rheum Dis,1970
3. Occurrence of rheumatoid arthritis in a nationwide series of twins;Aho, K.; Koskenvuo, M.; Tuominen, J.; Kaprio, J.;JtRheumatol,1986
4. Twin concordance rates for rheumatoid arthritis: a nationwide study;J, Silman A.; J, MacGregor A.; W, Thomson,1993
5. Epistatic modeling in rheumatoid arthritis: an application of the Risch theory;S, Rigby A.; L, Voelm; J, Silman A.;GenetEpidemiol,1993