A few days before Super Bowl 50 this Sunday comes sobering news: Onetime Oakland Raiders quarterback and Super Bowl MVP Ken Stabler had CTE, or chronic traumatic encephalopathy, a kind of dementia related to concussions and sub-concussive hits. 

Stabler, who died in July of cancer at age 69, left his brain to be studied by researchers in Massachusetts.

Of the 91 brains of ex-players that have been tested – you can’t test for this except after death – 87 had brain trauma. ...

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