NFL and NFLPA agree to update concussion protocols – The Oakland Post
NFL-NFLPA agree to a change in concussion protocols
NFL Players Association, NFL amend concussion protocol after Tagovalioa's injury
NFLPA agrees to concussion protocol changes, NFL responds - ESPN
Explaining the Tua Rule: How Tua Tagovailoa changed NFL's concussion protocol
NFL, NFLPA agree to make concussion protocols changes
NFL to change concussion protocol in wake of Tua Tagovailoa incident
NFL plans concussion protocol changes after Tua Tagovailoa incident - The Japan Times
NFL and players union agree to updated concussion protocol, Sports
NFL, NFLPA release statement, announce changes to concussion protocol – NBC Sports Bay Area & California
NFL concussions strategy for Super Bowl 52 includes a change