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3. Estimates of the prevalence of selected arthritic and musculoskeletal diseases in the United States;Lawrence;J Rheumatol.,1989
4. Peripheral arthritis in the elderly: a hospital study;Jenkinson;Ann Rheum Dis.,1989
5. Taking mortality in rheumatoid arthritis seriously—predictive markers, socioeconomic status and comorbidity;Pincus;J Rheumatol.,1986