Underscored by a $1 billion settlement between the National Football League and its former players is a lawsuit filed in 2013 by former National Hockey League players against the league.The suit initially alleged that the NHL knew about the risks of head trauma that its players assume and that they should have taken action to inform and protect the players from long-term health problems.The suit also detailed that the culture of violence surrounding the game continues to put these men in harm’s way and that the …