The link between head injuries and CTE in football, explained - Vox

DeAndre Levy explains his CTE comments on Instagram to the Free Press - Pride Of Detroit

NFL's new quarterback specific helmet design – United Brain Association

The link between head injuries and CTE in football, explained - Vox

Can Heading a Soccer Ball Cause a Concussion?

Does Soccer Have a Brain-Trauma Problem?

Breakthrough in CTE research - Chicago Sun-Times

Ready for some head trauma? What to make of CTE in the NFL news - Cincy Jungle

Ready for some head trauma? What to make of CTE in the NFL news - Cincy Jungle

Olin Kreutz: Football's Ultimate Defender - Windy City Gridiron

NFL Players Twice as Likely to Get Concussions in Cold Weath