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Frame-by-frame high-speed videolaryngoscopy imaging, at 4,000 frames per second, of a single glottal cycle in case 1 (no vocal alterations). The interval between frames is 0.25 milliseconds. The first frame shows the glottis at maximum closure, and the last frame shows the end of the mucosal wave excursion, immediately before the beginning of the next glottal cycle.
