Changes coming to NFL concussion protocol a needed step for player safety
N.F.L. Introduces New Rules to Back Its Concussion Protocol - The New York Times
Dolphins' Bridgewater leaves under revised concussion rules
Miami Dolphins quarterback Tua Tagovailoa placed in NFL concussion protocol for 2nd time, News
NFL and players union agree to updated concussion protocol, Sports
What we learned from Week 5 of the NFL season: Changes to concussion protocol, first coach firing and officiating controversies, News
NFL, union try to change culture on concussions - The San Diego Union -Tribune
Tua Tagovailoa's case has concussion protocol changes likely, NFL says
NFL players' union calls for changes in concussion rules by Sunday
Our sport can be safe and exciting': NFL points the way for dealing with concussion, NFL