This is an excerpt from the BBC's podcast, The Inquiry. The episode title is "How will the concussion issue affect the future of sport?" This short excerpt on expert Tris Dixon, the author of Damage: The Untold Story of Brain Trauma in Boxing. The full episode, covering concussions in American football, soccer, and more can be found here - https://www.bbc.co.uk/sounds/play/w3ct1z1q