Ultrasound high-resolution live imaging was performed using a curvilinear Clarius™ scanner (C3, Clarius, Burnaby, British Columbia, Canada; frequency range: 2–6 MHz, depth: 3–30 cm, size: 169 mm × 105 mm × 41 mm) that conforms the anatomy of the chin. The scanner connected wirelessly to the Clarius™ application software (Burnaby, British Columbia, Canada) that was installed on an iPad (screen size 20 cm × 15 cm) with ultrasound recordings visualised on the iPad (20 frames/s). For videofluoroscopic imaging, the Fluorostar 7900 (GE OEC Medical Systems GmbH, Wendelstein, Germany) was used (25 frames/s).

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