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The damage caused by concussion can be detected months after the injury and long after patients feel like they have recovered, brain scans show.
Concussion has become highly controversial in sport, with concerns raised that players are putting their brain at risk.
Researchers at the University of New Mexico said athletes may be being returned to action too quickly.
While UK doctors said the attitude to head injury was "too relaxed" in sport.
http://www.bbc.co.uk/news/health-24991844
Concussion has become highly controversial in sport, with concerns raised that players are putting their brain at risk.
Researchers at the University of New Mexico said athletes may be being returned to action too quickly.
While UK doctors said the attitude to head injury was "too relaxed" in sport.
http://www.bbc.co.uk/news/health-24991844