title: Efficacy of patient controlled analgesia may have a diurnal rhythm!
authors.forename: N G
authors.initials: NG
authors.lastname: Richardson
authors.forename: W R
authors.initials: WR
authors.lastname: Peckett
authors.forename: D R
authors.initials: DR
authors.lastname: Donaldson
mesh_terms: D000368:Aged; D016058:Analgesia, Patient-Controlled; D002940:Circadian Rhythm; D006801:Humans; D008297:Male; D009622:Noise; D010149:Postoperative Pain / Q000188:drug therapy*