Doctor explains what likely caused Damar Hamlin's cardiac arrest
Bills' Damar Hamlin OK to play after suffering cardiac arrest - ESPN
EXPLAINER: What happened to Damar Hamlin?
What is the link between cardiac arrest and excessive stress from sports? Experts weigh in
NFL (National Football League)
Explainer: What happened to Buffalo Bills safety Damar Hamlin?
Explainer: What happened to Buffalo Bills safety Damar Hamlin?
Damar Hamlin's collapse is the latest in history of medical emergencies in sports - ABC News
Damar Hamlin injury update: Buffalo Bills player awake and conscious, asks 'did we win?' - ABC7 Chicago
Damar Hamlin communicating, improving after cardiac arrest
Joe Burrow discusses 'very, very scary' Damar Hamlin situation: 'It was a very emotional 48 hours'