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Tracking marker placement. The photograph shows the locations of markers used to obtain the coordinates of specific locations by the motion capture method. On the highest part of the forehead, marker R showing the reference point was fixed. No. 0 marker was put on the bottom of the chin as the contrast point to the points of the cheek, and No. 1 to 7 markers were fixed on the locations from the lowest to highest parts of the left cheek.
