title: Difficulties in defining antinuclear antibody-positive patients as a separate category in the classification of juvenile idiopathic arthritis: comment on the article by Ravelli et al.
authors: Ellen
authors: E
authors: Nordal
authors: Nils T
authors: NT
authors: Songstad
authors: Marite
authors: M
authors: Rygg
mesh_terms: D000974:Antibodies, Antinuclear / Q000276:immunology*; D001171:Arthritis, Juvenile / Q000145:classification* / Q000276:immunology*; D005260:Female; D006801:Humans; D008297:Male
chemical_list: D000974:Antibodies, Antinuclear