Associated Press
FILE - In this Nov. 14, 2011 file photo, Hall of Fame football player Forrest Gregg talks about his battle with Parkinson's disease during an interview in Colorado Springs, Colo. Gregg is raising awareness for Parkinson's disease 18 months after his diagnosis. While Gregg and his neurologist believe the debilitating neurological disorder stems from the many concussions he sustained during his playing career, Gregg says he's rebuffed overtures to join thousands of former players suing the NFL. (AP Photo/Ed Andrieski, File)

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