NFL, players' union agree to modify concussion protocol after Dolphins QB Tua Tagovailoa injury
New NFL concussion protocol in effect today from weekend agreement, News
NFL making significant changes to concussion protocol - ESPN
The NFL's concussion protocol problem – The Prospector
NFL's concussion protocol modified after Tagovailoa review
NFL, Players Union Agree to Change Concussion Protocol - The New York Times
NFLPA wants changes to concussion protocol by this weekend
The NFL concussion protocol cannot save football
As new NFL concussion protocols stall, Rams' David Edwards returns - Los Angeles Times