Figure 4.

Descriptions of parameters used to calculate asymmetric indices. ${\text{P}}_{23}$ and ${\text{P}}_{26}$ represent left and right medial canthus, respectively. Blue horizontal line is drawn by extending connecting line between ${\text{P}}_{23}$ and ${\text{P}}_{26}$. EM is center point of ${\text{P}}_{23}$ and ${\text{P}}_{26}$. Blue vertical line is drawn perpendicular to horizontal line that passes EM. LEB indicates mean point from left eyebrow. REB indicates mean point from right eyebrow. ${\text{P}}_{32}$ and ${\text{P}}_{38}$ represent left and right mouth corners, respectively. $D_{LEB}$ indicates distance between LEB and point of intersection. $D_{LM}$ indicates distance between point of mouth corner and point of intersection.