NFL to make changes to the league's concussion protocol - CBS Philadelphia
Dolphins deny Tua Tagovailoa played with concussion as NFL investigates, Miami Dolphins
NFLPA President JC Tretter: Concussion Protocols: Where We Stand Now - OnFocus
Dolphins' Tua Tagovailoa considered retirement after concussions
NFL, NFLPA agree to parameters of updated concussion protocols
NFL, players union agree on updated concussion protocol – WFTV
NFL and NFLPA to make changes to Concussion Protocol to improve player safety after Tua injury
Tua Tagovailoa's Head Injury Prompts Changes To NFL Concussion Protocols - WSJ
AP Source: Tagovailoa to miss Pro Bowl, still in protocol - The San Diego Union-Tribune
NFL's concussion protocol modified after Tagovailoa review
NFL modifies concussion protocol after review of Tagovailoa injury
Dolphins' loss to Bengals overshadowed by Tua Tagovailoa's hospitalization, NFL
Investigation: Dolphins followed protocol in Tua concussion check
Explaining the NFL's latest concussion controversy and policy change : NPR