Analgesia during labour with pethidine epidurally.
D000767:Anesthesia, Epidural; D000773:Anesthesia, Obstetrical; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008614:Meperidine; D011247:Pregnancy; D013997:Time Factors
D008614:Meperidine