smile mask syndrome
... that smile mask syndrome may affect people whose jobs force them to smile for many hours per day, and is particularly common in Japan and Korea?
... that <b id="mwEDE"><a href="./Smile_mask_syndrome" id="mwEDI" rel="mw:WikiLink" title="Smile mask syndrome">smile mask syndrome</a></b> may affect people whose jobs force them to smile for many hours per day, and is particularly common in Japan and Korea?