Anaesthesia and maternal mortality.
D000765:Anesthesia, Conduction / Q000401:mortality; D000769:Anesthesia, Inhalation / Q000401:mortality; D000772:Anesthesia, Local / Q000401:mortality; D000773:Anesthesia, Obstetrical / Q000401:mortality; D008428:Maternal Mortality; D006113:United Kingdom