title: PCA: a new way to spell pain relief.
mesh_terms: D000700:Analgesics / Q000008:administration & dosage*; D002763:Cholecystectomy; D005260:Female; D006801:Humans; D010149:Postoperative Pain / Q000188:drug therapy*; D010353:Patient Education as Topic; D012646:Self Administration / Q000295:instrumentation*
chemical_list: D000700:Analgesics