Florio] Joe Burrow, who has no official history of concussions but
New devices, practice habits aim to curb concussions in high
Health issues in American football - Wikipedia
Study: Limiting contact in practice reduces football head injuries
Helmet hits causing more than just concussions - The Boston Globe
If in doubt, sit them out: New concussion guidelines for
The NFL is making data-driven progress on leg muscle injury
Concussions Dropped More Than 50 Percent for Players Who Wore
NFL Gets Tech Help for Its Concussion Issue - WSJ
NFL's handling of concussions questioned after Tua's injury