NFL and NFLPA to make changes to Concussion Protocol to improve player safety after Tua injury
Joint NFL-NFLPA Statement: Joint Review of the Application of the NFL's Concussion Protocol - Training & Conditioning
NFL, Players Union Agree to Change Concussion Protocol - The New York Times
Dolphins followed concussion protocol with Tagovailoa's injury
NFL/NFLPA making changes to concussion protocol
Protecting the brain: Tua Tagovailoa, concussions and the NFL
NFL, players union agree on updated concussion protocol, Trending Archives
The NFL and players union agreed to an updated concussion protocol : NPR
NFL Concussion Protocol 'Big Step to Making Game Safer for Players': Expert