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A randomized controlled trial of preinsertion ultrasound guidance for spinal anaesthesia in pregnancy: outcomes among obese and lean parturients

Obstetric ImagingSpinal AnaesthesiaOutcomes ResearchMaternal HealthLean ParturientsSurgeryMaternal-fetal MedicineIntrapartum UltrasoundUltrasoundAnesthesiaMedicinePreinsertion Ultrasound GuidanceHigh-risk PregnancyAnesthesiology