title: A randomized trial of vitamin A and vitamin E supplementation for retinitis pigmentosa.
authors.forename: J W
authors.initials: JW
authors.lastname: Gamel
authors.forename: C C
authors.initials: CC
authors.lastname: Barr
mesh_terms: D006801:Humans; D012107:Research Design; D012174:Retinitis Pigmentosa / Q000188:drug therapy*; D016896:Treatment Outcome; D014801:Vitamin A / Q000627:therapeutic use*; D014810:Vitamin E / Q000627:therapeutic use*
chemical_list: D014801:Vitamin A; D014810:Vitamin E