title: [Long-term observation of healthy persons with rheumatoid factor in the blood].
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*; D012698:Serologic Tests
chemical_list: D012217:Rheumatoid Factor
vernacular_title: Langzeitbeobachtung von gesunden Personen mit Rheumafaktoren im Blutserum.