Hypovitaminosis A in Rio Grande do Sul, Brazil. Preliminary study.
D001938:Brazil; D002675:Child, Preschool; D004032:Diet; D006801:Humans; D011933:Reagent Kits, Diagnostic; D012395:Rose Bengal; D014801:Vitamin A / Q000097:blood*; D014802:Vitamin A Deficiency / Q000175:diagnosis / Q000453:epidemiology*
D011933:Reagent Kits, Diagnostic; D014801:Vitamin A; D012395:Rose Bengal