title: Knowledge and action in the control of vitamin A deficiency.
mesh_terms: D001938:Brazil; D002648:Child; D002675:Child, Preschool; D005247:Feeding Behavior; D006205:Haiti; D006801:Humans; D007194:India; D007223:Infant; D014802:Vitamin A Deficiency / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D014944:World Health Organization; D014985:Xerophthalmia / Q000453:epidemiology / Q000209:etiology