NFL-NFLPA agree to a change in concussion protocols
NFL concussion lawsuits explained, NFL
NFL and players union agree to updated concussion protocol, Sports
Kickoff rule tied to fewer concussions in new research
Concussion Protocol & Return-to-Participation Protocol: Overview
Concussion Protocol & Return-to-Participation Protocol: Overview
The Football Player's Brain That Sparked the NFL's Concussion Crisis - The Atlantic
Majority of Americans Support Changing the NFL Concussion Protocol
NFL's concussion protocol modified after Tagovailoa review
NFLPA agrees to concussion protocol changes, NFL responds - ESPN