Enter your PIN <a href=" http://blog.cilek.com/etiket/yoga/ ">para que serve o revatio</a> CTE represents a watershed moment in professional sport: “a public health crisis that emerged from the playing fields of our 21st-century pastime,” in the words of Mark Fainaru-Wada and Steve Fainaru, co-authors of the book ‘League of Denial’ that provided the basis for the two-hour documentary. Originally a co-sponsored project between Frontline and ESPN, the sports network removed its name in August. Central to ‘League of Denial’ is the question of the NFL’s knowledge of the impact of such concussion injuries – both what they knew and when they knew it.