These players have publicly acknowledged either having been diagnosed with likely CTE or having suffered symptoms, such as dementia or unusual memory loss, consistent with CTE. In some cases, the player has received a diagnosis of ALS but symptoms are consistent with CTE. There are at least two dozen former players who were diagnosed as part of a UCLA study but have not come forward publicly.  There are also around 4,500 former players who joined a class action suit against the NFL alleging that it had covered up a growing body of medical evidence about the preponderance of head-trauma related CTE in ex-NFL players. 
Those stats also don’t include the blow to the head against Pittsburgh’s Antonio Brown in a January 2016 playoff game that gifted the Steelers 15 yards toward a game-winning field goal — and got Burfict suspended for the first three games of the 2016 season. A lot of Burfict’s controversial plays have been against Pittsburgh, but there also was his apparent ankle-twist against Newton in 2015, the shot later that season against Ravens tight end Maxx Williams (who was merely running a decoy route) and a low hit against New England’s Martellus Bennett when Bennett was not the intended receiver last season. There are multiple YouTube videos dedicated to Burfict’s art.