title: Does the negative association between rheumatoid arthritis and schizophrenia provide clues to the aetiology of rheumatoid arthritis?
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000453:epidemiology* / Q000209:etiology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D012107:Research Design / Q000592:standards; D012559:Schizophrenia / Q000150:complications* / Q000453:epidemiology