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Fernández-Vaquero, Miguel Ángel; Charco-Mora, Pedro; García-Aroca, Miguel Ángel; Greif, Robert (2023). Preoperative airway ultrasound assessment in the sniffing position: a prospective observational study. Brazilian journal of anesthesiology, 73(5), pp. 539-547. Elsevier 10.1016/j.bjane.2022.07.003