Tawfik MM, Tolba MA, Ismail OM, Messeha MM, et al. Ultrasonography versus palpation for spinal anesthesia in obese parturients
undergoing cesarean delivery: a randomized controlled trial. Reg Anesth Pain Med 2023 May 15:rapm-2022-104272. doi: 10.1136/rapm-2022-104272.
PMID: 37188389