NFL concussion protocol: What are the steps for return to play?
NFL, Players Union Agree to Change Concussion Protocol - The New York Times
NFL, NFLPA say concussion protocol was not violated after Tua Tagovailoa was injured vs. Packers
Tua Tagovailoa ruled out of Dolphins' playoff game vs. Bills
Dolphins' Tua gets two preseason drives; Daewood Davis injured
NFL's concussion protocol again under scrutiny after Tua Tagovailoa is hit hard again
Two concussions don't always add up to second impact syndrome - KTVZ
Tua Tagovailoa's Injury Exposes The NFL's Priorities
Dolphins QB Tua Tagovailoa discharged from hospital Thursday after suffering concussion vs. Bengals