Opioids in labour.
Twycross
R
R
D016362:Analgesia, Obstetrical / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D008614:Meperidine / Q000008:administration & dosage; D009020:Morphine / Q000008:administration & dosage; D011247:Pregnancy
D000701:Analgesics, Opioid; D009020:Morphine; D008614:Meperidine