NFL players union urges quick changes to concussion protocol
The NFL concussion protocol cannot save football
NFL faces intense scrutiny over concussion protocols
How does the NFL's concussion protocol work? Explaining the five-step process for return to play
As new NFL concussion protocols stall, Rams' David Edwards returns - Los Angeles Times
NFL, NFLPA agree to make concussion protocols changes
NFL Health and Safety Fact Sheet
NFL, NFLPA agree to new concussion protocol that will be in effect on Sunday - NBC Sports
N.F.L. Agrees to Settle Concussion Suit for $765 Million - The New York Times
NFL players union urges quick changes to concussion protocol - WSVN 7News, Miami News, Weather, Sports
N.F.L. Agrees to Settle Concussion Suit for $765 Million - The New York Times
Tua Tagovailoa Rule? NFL, NFLPA reportedly working on change preventing players' return after 'instability'
NFL, NFLPA agree to make concussion protocols changes