title: Nutritional anemia in selected groups of children and youth of Warsaw and Ciechanów schools.
mesh_terms: D000293:Adolescent; D000747:Anemia, Hypochromic / Q000453:epidemiology*; D002648:Child; D005260:Female; D005494:Folic Acid Deficiency / Q000453:epidemiology*; D006801:Humans; D008297:Male; D011044:Poland; D014504:Urban Health