title: Seronegative rheumatoid arthritis in an eight-year longitudinal study.
authors.affiliation: National Public Health Institute, Helsinki, Finland.
authors.forename: T
authors.initials: T
authors.lastname: Tuomi
authors.forename: K
authors.initials: K
authors.lastname: Aho
authors.forename: T
authors.initials: T
authors.lastname: Palosuo
authors.forename: K
authors.initials: K
authors.lastname: Kaarela
authors.forename: R
authors.initials: R
authors.lastname: von Essen
authors.forename: H
authors.initials: H
authors.lastname: Isomäki
mesh_terms: D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000276:immunology*; D005188:False Negative Reactions; D005189:False Positive Reactions; D005500:Follow-Up Studies; D006801:Humans; D007124:Immunoenzyme Techniques; D008137:Longitudinal Studies; D011933:Reagent Kits, Diagnostic; D012217:Rheumatoid Factor / Q000032:analysis*
chemical_list: D011933:Reagent Kits, Diagnostic; D012217:Rheumatoid Factor