title: Postoperative pain undertreated in the United States.
mesh_terms: D000700:Analgesics / Q000627:therapeutic use*; D006801:Humans; D010147:Pain Measurement / Q000592:standards*; D010149:Postoperative Pain / Q000188:drug therapy* / Q000209:etiology; D011182:Postoperative Care
chemical_list: D000700:Analgesics