LOS ANGELES (AP) -- ''Concussion'' delivers a hard hit to the NFL as it deals with data linking repeated blows to the heads of its players to dementia and a host of other problems. The league's rocky dealings with Dr. Bennet Omalu, who identified a degenerative disease in football players known as CTE, or chronic traumatic encephalopathy, are the focus of the movie's second hour. Starring Will Smith and Alec Baldwin, ''Concussion'' had its premiere Tuesday night at AFI Fest in Hollywood. More...