CPR performed on Bills player on field after he collapses during Monday Night Football
Bills' Hamlin in critical condition after collapse on field - WTOP News
How an NFL hit like Damar Hamlin's can stop a heart - Gothamist
Monday Night Football Game postponed by NFL after collapse of Bills' Safety
Bills GM: Damar Hamlin medically cleared to resume playing
Buffalo Bills safety Damar Hamlin injury shows the need for sports doctors
Who is Damar Hamlin, the Buffalo Bills player who collapsed at Monday's game? : NPR
Bills' Damar Hamlin in Critical Condition After Hit During Bengals Game - The New York Times
Damar Hamlin shows 'signs of improvement,' Buffalo Bills say
Bills' Damar Hamlin in critical condition after collapsing on field, receiving CPR
Cardiologist discusses collapse of Buffalo safety Damar Hamlin during NFL game