Stockbyte/Thinkstock(NEW YORK) -- New research is strengthening the link between long-term brain damage and playing football.
ESPN and PBS' Frontline are working on a documentary and report that scientists have discovered 28 new cases of chronic brain disease in football players who have died -- 15 of them, former NFL players.
One researcher says the sheer volume of cases proves no one can deny there's a problem.
Copyright 2012 ABC News Radio


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