title: Vitamin A deficiency and xerophthalmia.
mesh_terms: D006077:Government Agencies; D006801:Humans; D014481:United States; D014802:Vitamin A Deficiency / Q000150:complications* / Q000517:prevention & control; D014944:World Health Organization; D014985:Xerophthalmia / Q000209:etiology* / Q000517:prevention & control