title: Prophylaxis of vitamin A deficiency: a collaborative field trial.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008875:Middle Aged; D009755:Night Blindness / Q000188:drug therapy* / Q000517:prevention & control; D014801:Vitamin A / Q000008:administration & dosage / Q000627:therapeutic use*; D014802:Vitamin A Deficiency / Q000517:prevention & control
chemical_list: D014801:Vitamin A