title: [Rheumatoid arthritis in children up to the age of 15 in Poland].
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001171:Arthritis, Juvenile / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011044:Poland; D012737:Sex Factors
vernacular_title: Wystepowanie reumatoidalnego zapalenia stawów u dzieci do lat 15 na terenie Polski