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Prospective study of the early course of rheumatoid arthritis in young adults: Comparison of patients with and without rheumatoid factor positivity at entry and identification of variables correlating with outcome

Rheumatoid DisorderRheumatologyEpidemiologyYoung AdultsAutoimmune DiseaseRheumatic DiseasesClinical EpidemiologyEarly CourseInflammatory Rheumatic DiseasePublic HealthMedicineRheumatoid Arthritis