A chronic brain disease afflicts former pro football players, boxers and others who suffer repeated brain injuries. Doctors now can only diagnose it with certainty after someone dies. But researchers are working on tests that could work while people are alive.
Source: http://www.npr.org/blogs/health/2013/12/16/251695041/concussion-research-slowed-by-shortage-of-brains?ft=1&f=1055
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