Letter: Beta-thalassaemic trait and rheumatoid arthritis.
D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D006801:Humans; D007558:Italy; D008297:Male; D008875:Middle Aged; D012744:Sex Ratio; D013789:Thalassemia / Q000150:complications* / Q000453:epidemiology