The link between head injuries and CTE in football, explained - Vox
Brain Trauma Scientists Turn Their Attention to Soccer
Injuries make the NFL a brutal sport. But the violence is partly
Youth sports: Why it's not safe for your child to play tackle football
Playing football young may mean earlier cognitive, emotional
Study finds no link between youth contact sports and cognitive
Study links youth football to greater risk of later health
Aaron Hernandez Documentary Highlights CTE Problems in the NFL
NFL player's injury reignites debate among parents about youth sports