NFL players' union calls for changes in concussion rules by Sunday
The NFL's concussion protocol problem – The Prospector
Tua Tagovailoa's concussion, protocols collide: What followed for NFL
NFL Concussion Protocol After Miami Dolphins Quarterback Tua Tagovailoa - Bloomberg
NFL to make changes to the league's concussion protocol - CBS Philadelphia
Tua Tagovailoa Mess Led to New NFL Concussion Rules, But They Have a Glaring Hole
NFL Players Association, NFL amend concussion protocol after Tagovalioa's injury
NFLPA wants the changes in concussion protocol to be put into place for this weekend's games: : r/fantasyfootball
NFL, NFLPA agree to make concussion protocols changes
NFL players union urges quick changes to concussion protocol - WSVN 7News, Miami News, Weather, Sports
The NFL and players union agreed to an updated concussion protocol : NPR
NFL-NFLPA agree to a change in concussion protocols
Tua Tagovailoa Rule? NFL, NFLPA reportedly working on change preventing players' return after 'instability'
NFL Health and Safety Fact Sheet
Former NFL players with lots of concussions may have higher stroke risk