1. Effects of Competition Rule Changes on the Incidence of Head Kicks and Possible Concussions in Taekwondo. Issue 3 (May 2016) Authors: Jae-Ok, Koh; Voaklander, Don Journal: Clinical journal of sport medicine Issue: Volume 26:Issue 3(2016) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗