Extradural opioids in labour.
Herman
N L
NL
Hussain
F L
FL
Knape
K G
KG
Downing
J W
JW
D015360:Analgesia, Epidural; D000701:Analgesics, Opioid; D000773:Anesthesia, Obstetrical; D005260:Female; D006801:Humans; D011247:Pregnancy
D000701:Analgesics, Opioid