Hypovitaminosis A: a public health problem.
D001938:Brazil; D002675:Child, Preschool; D004032:Diet; D005260:Female; D006801:Humans; D007774:Lactation; D011247:Pregnancy; D011634:Public Health; D012306:Risk; D014801:Vitamin A / Q000097:blood; D014802:Vitamin A Deficiency / Q000150:complications / Q000453:epidemiology / Q000517:prevention & control*; D014985:Xerophthalmia / Q000209:etiology*
D014801:Vitamin A