Pain relief in labour.
D000698:Analgesia; D000701:Analgesics, Opioid; D000767:Anesthesia, Epidural; D000769:Anesthesia, Inhalation; D000773:Anesthesia, Obstetrical; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D009321:Natural Childbirth; D009609:Nitrous Oxide; D011247:Pregnancy; D012064:Relaxation Therapy
D000701:Analgesics, Opioid; D009609:Nitrous Oxide