Accuracy of ultrasound-measured skin-to-hyoid bone distance for predicting difficult mask ventilation in patients with obesity: a prospective observational study. - Mostafa, Maha; ElGeneidi, Israa; Hasanin, Ahmed; Ali, Mostafa; Mostafa, Hanan; Naguib, Nader Noshy (Korean Journal of Anesthesiology, 2026)