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Relationships between the ultrasound measurements of anterior neck soft tissue thicknesses and the screening tests in predicting difficult laryngoscopy. The solid lines are regression lines. r=correlation coefficient. DSHB: the minimum distance from skin to hyoid bone; DSEM: the distance from skin to epiglottis midway between the hyoid bone and thyroid cartilage; DSAC: the minimum distance from skin to anterior commissure; IIG: Interincisor gap; MMS: modified Mallampati score.
