Sharpe, E E Need for additional anesthesia after single injection spinal analgesia for labor: a retrospective cohort study. [electronic resource] - International journal of obstetric anesthesia 11 2019 - 45-51 p. digital Publication Type: Journal Article ISSN: 1532-3374 Standard No.: 10.1016/j.ijoa.2019.05.013 doi Subjects--Topical Terms: AdultAnalgesia, Epidural--methodsAnalgesia, Obstetrical--methodsAnesthesia, Obstetrical--methodsCohort StudiesFemaleHumansInjections, SpinalLabor, ObstetricPregnancyRetrospective Studies