Letter: Patient-controlled intravenous narcotic administration during labour.
D000773:Anesthesia, Obstetrical; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D007743:Labor, Obstetric; D008614:Meperidine / Q000008:administration & dosage*; D011247:Pregnancy
D008614:Meperidine