title: Age and calendar year of onset in sibling pairs with rheumatoid arthritis.
authors.forename: A J
authors.initials: AJ
authors.lastname: Silman
authors.forename: W E
authors.initials: WE
authors.lastname: Ollier
mesh_terms: D000367:Age Factors; D001172:Arthritis, Rheumatoid / Q000235:genetics* / Q000503:physiopathology; D006801:Humans