title: Letter: Vitamin A deficiency, xerophthalmia and blindness.
mesh_terms: D000818:Animals; D002648:Child; D006801:Humans; D009755:Night Blindness / Q000097:blood; D009751:Nutritional Requirements; D014801:Vitamin A / Q000378:metabolism; D014802:Vitamin A Deficiency / Q000097:blood; D014985:Xerophthalmia / Q000097:blood; D015032:Zinc / Q000097:blood / Q000502:physiology
chemical_list: D014801:Vitamin A; D015032:Zinc