Hypovitaminosis A in the Americas.
D002489:Central America; D002648:Child; D002675:Child, Preschool; D004032:Diet; D006801:Humans; D013020:South America; D014801:Vitamin A / Q000097:blood; D014802:Vitamin A Deficiency / Q000175:diagnosis / Q000188:drug therapy / Q000453:epidemiology* / Q000517:prevention & control; D014985:Xerophthalmia / Q000209:etiology
D014801:Vitamin A