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Principle of the Kinovea-derived method. Rest. (a) Each dot was drawn on the subject's face with face paint, corresponding to the preselected markers. The two dots on the forehead are 5 cm apart and are used for calibration. (b) Each line indicates distance measurements corresponding to the 6 selected muscles at rest. The lines from mid upper lip to the cheek point 4 cm out are used for both buccinator and orbicularis oris measurements.
