NFL Legend Brett Favre Says He's Likely Had 'Thousands' of Concussions
BU Finds CTE in Nearly 92 Percent of Ex-NFL Players Studied
Chiefs QB Patrick Mahomes out of concussion protocol, is cleared
Kansas City Chiefs QB Brady Quinn ruled out with concussion, Matt
Seahawks safety Jamal Adams suffers concussion on first drive
NFL medical chief admits 'more work to be done' on concussion
Miami Dolphins QB Tua Tagovailoa stretchered off with head injury
Former Browns QB Bernie Kosar talks about having over 100