During both direct laryngoscopy and after placement of the TTK, the best laryngoscopic vision achieved will be recorded, based on the Cormack‑Lehane scale and POGO, together with the laryngoscopy and intubation times. The laryngoscopy time is defined as the time elapsed from insertion of the laryngoscope or study device through the teeth to best vision of the glottis. The intubation time in turn is defined as the time elapsed from collapse of the endotracheal tube cuff to definitive positioning of the instrument beyond the vocal cords (insertion mark on the tube), following capnographic confirmation of correct intubation. If correct positioning is not achieved, the maneuver will be repeated, recording the time from collapse of the cuff in the esophagus to correct positioning of the endotracheal tube. The times will be recorded as accurately as possible. The use of a chronometer is advised.