大象传媒

5 live Sport follows up the issue of American Football players affected by concussion within the NFL, featuring an exclusive interview with the chairman of the San Francisco 49ers Dr John York, who also heads up the NFL's Health and Safety Commission.

Hear from both players and their family members who have been affected, and from the doctor who discovered this condition. Dr Barry O'Driscoll, former medical advisor with the International Rugby Board, also joins us as we discuss how this issue is being addressed in rugby.