title: A rationale for studying analgesia: a double-blind study in postpartum patients.
mesh_terms: D000328:Adult; D000700:Analgesics / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D008722:Methods; D010919:Placebos; D011247:Pregnancy
chemical_list: D000700:Analgesics; D010919:Placebos