title: Addition of retinoids to PUVA for psoriasis.
mesh_terms: D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D006801:Humans; D011701:PUVA Therapy; D010778:Photochemotherapy; D011565:Psoriasis / Q000188:drug therapy*; D014801:Vitamin A / Q000031:analogs & derivatives* / Q000627:therapeutic use
chemical_list: D014801:Vitamin A