Roger Goodell spoke at length about recent CTE studies on Thursday.

"We appreciate the studies and we actually not only appreciate them, we funded a lot of these studies," said Goodell. "What we all need is more information. There is one thing that is clear among this medical community is that we have a lot more questions than we have answers. We need more research and I think we have led the way on that front. We've not only led with research, but we've led with rule changes to our game, we've led on awareness to the injuries, we've led on how we can develop new equipment that will make our game safer for our players.

"There's a new helmet coming out this year that came out of what we call the GE NFL Head Health Initiative. We put it out that - how do we use new materials, how do we use new technology to create a better helmet that's going to absorb the impact? And we have one that's hitting the market this year. It was developed by somebody in Seattle. It was funded with that money.

"I think that because of that leadership, because we've taken responsibility to really manage the health and safety of our players that is going to be seen as 'Hey, they're doing the right things. Sure they have challenges, but so does every active sport.' What we're learning in our sport is helping every other sport."