Gambling, D R Lumbar ultrasound: useful gadget or time-consuming gimmick? [electronic resource] - International journal of obstetric anesthesia Oct 2011 - 318-20 p. digital Publication Type: Journal Article; Review ISSN: 1532-3374 Standard No.: 10.1016/j.ijoa.2010.10.001 doi Subjects--Topical Terms: Anesthesia, Epidural--methodsAnesthesia, Obstetrical--methodsEpidural Space--diagnostic imagingFemaleHumansLumbar Vertebrae--diagnostic imagingPregnancyUltrasonography