title: Smoking and rheumatoid arthritis--observations from a multicase family study: comment on the article by Silman et al.
authors.forename: J E
authors.initials: JE
authors.lastname: McDonagh
authors.forename: D J
authors.initials: DJ
authors.lastname: Walker
mesh_terms: D001172:Arthritis, Rheumatoid / Q000209:etiology*; D004200:Diseases in Twins / Q000209:etiology*; D006801:Humans; D012907:Smoking / Q000009:adverse effects*