Medical officials say NFL player Damar Hamlin has made 'substantial improvement'
Buffalo Bills safety Damar Hamlin exits game via ambulance after scary collapse, requires CPR - On3
Damar Hamlin: Buffalo Bills player in critical condition in hospital after cardiac arrest on field during game against Cincinnati Bengals, NFL News
Why did Damar Hamlin collapse?
Damar Hamlin cardiac arrest: Everything you need to know about collapse of Bills player.
Damar Hamlin: Bills safety's vitals 'back to normal' after collapsing on MNF
After Damar Hamlin's collapse, the NFL gave players time - Los Angeles Times
Bills-Bengals game suspended, Damar Hamlin in critical condition
The Reaction to Damar Hamlin's Collapse Represents Progress
The League Did Not Cancel the Game,” the Bills and Bengals Did
Bills-Bengals Game Won't Resume This Week After Damar Hamlin Collapse