title: PCA demand buttons.
authors.forename: L
authors.initials: L
authors.lastname: Southall
authors.forename: P E
authors.initials: PE
authors.lastname: Macintyre
authors.forename: T G
authors.initials: TG
authors.lastname: Semple
mesh_terms: D000700:Analgesics / Q000008:administration & dosage*; D004867:Equipment Design; D006801:Humans; D007275:Injections, Intravenous / Q000295:instrumentation*; D012651:Self Medication
chemical_list: D000700:Analgesics