CTE cases in soccer players raise fresh questions about safety of heading the ball
CQ Researcher - CTE and Athletes
The Impact Of 'Concussion': High School Football Player Changes Course
Here's what we know about football, concussions, and the brain - Vox
5 NFL Athletes Who Had CTE
The link between head injuries and CTE in football, explained - Vox
CTE In Athletes Linked To Hits To The Head, Even Without Concussions : Shots - Health News : NPR
NHL says there is no connection between hockey and degenerative brain disease : NPR
Some people who never played pro sports still fear CTE. Here are their stories : NPR