NFL concussion protocol updated in wake of Tagovailoa injury - The Times-Delphic
Tua Tagovailoa: NFL urged to make 'tangible change' to concussion policy in wake of Miami Dolphins quarterback's head injury, NFL News
The NFL and players union agreed to an updated concussion protocol : NPR
Our sport can be safe and exciting': NFL points the way for dealing with concussion, NFL
NFL concussions strategy for Super Bowl 52 includes a change
What the NFL must do to find flaws in concussion protocol
NFL faces intense scrutiny over concussion protocols, Health
NFL's concussion protocol again under scrutiny after Tua Tagovailoa is hit hard again
NFL players union renews call for grass fields after Aaron Rodgers' injury
NFL-NFLPA agree to a change in concussion protocols
NFL Health and Safety Fact Sheet
NFL and players union agree to updated concussion protocol, Sports
The N.F.L. Issues New Guidelines on Concussions - The New York Times
NFL, NFLPA Agree On Concussion Protocols, Conclude Investigation