title: Comment on the article by Calin et al.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology* / Q000473:pathology; D015804:HLA-DR4 Antigen / Q000276:immunology*; D006801:Humans; D012217:Rheumatoid Factor / Q000032:analysis*
chemical_list: D015804:HLA-DR4 Antigen; D012217:Rheumatoid Factor