Buffalo Bills player is in critical condition after collapsing in game : NPR
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Tua Tagovailoa took two big hits in a week. What is NFL protocol on concussions? : NPR
How does NFL protocol work? What does Tua Tagovailoa's hit mean?
Tua Tagovailoa Reportedly Clears Concussion Protocol for Second Time
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Tua Tagovailoa in concussion protocol three months after head injury
Local neuropsychologist, father of NFL player talks concussions, brain injury risks