Damar Hamlin likely suffered 'very rare' commotio cordis, says Boston-area cardiologist who urges better training for CPR, defibrillators
NFL Cancels Bills Game After Damar Hamlin Suffers Cardiac Arrest
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Commotio cordis: Why NFLer Damar Hamlin's heart stopped
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Damar Hamlin cardiac arrest: Everything you need to know about collapse of Bills player.
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What is commotio cordis, which NFL player Damar Hamlin says stopped his heart?
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