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As the Rugby World Cup kicks off, former rugby international John Beattie investigates the link between the sport and brain injuries. He hears worries from those inside the industry that the elite game is putting players at risk, and how these risks could affect the future of the sport. As John travels to the United States to look at scientific evidence that a rugby career can damage the brain long term, top doctors in the game explain what the sport is doing to tackle the problem.