Fig. 1

A schematic illustration of the procedure. a Injection into the anterior belly of the digastric muscle was performed using a submental approach. b The injection points are shown. Each point received 5 units of BTX-A
A schematic illustration of the procedure. a Injection into the anterior belly of the digastric muscle was performed using a submental approach. b The injection points are shown. Each point received 5 units of BTX-A