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"Erythrocyte Sedimentation Rate, C-Reactive Protein, or Rheumatoid Factor Are Normal at Presentation in 35%-45% of Patients with Rheumatoid Arthritis Seen Between 1980 and 2004: Analyses from Finland and the United States." The Journal of Rheumatology
(2009):
jrheum.080770.
Web. 29 Mar. 2024.