"The N.F.L. agreed to pay $765 million to settle a lawsuit brought by more than 4,000 retirees with advanced dementia and other problems as well as the families of players who have died from what they claimed were the long-terms effects of head trauma."
Yep. Head trauma= Higher chance of dementia.
Meanwhile: I will be giving a talk on brain injury and caregiving at the May 15, 2014 Brain Injury Assoc. of California conference in Los Angeles.