The onset of rheumatoid arthritis in the aged.
D000368:Aged; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000453:epidemiology*; D001799:Blood Sedimentation; D005260:Female; D006452:Hemoglobinometry; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D008910:Minnesota; D009369:Neoplasms / Q000209:etiology; D012189:Retrospective Studies; D012723:Sex