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Doctors explain why Buffalo Bills safety Damar Hamlin collapsed as
Damar Hamlin: Buffalo Bills safety showing 'remarkable improvement
Memphis heart doctor explains Damar Hamlin collapse
Bills' Damar Hamlin in critical condition after collapse on field
Explainer: What happened to Damar Hamlin?
Buffalo Bills safety Damar Hamlin exits game via ambulance after
Who is Damar Hamlin, the Buffalo Bills player who collapsed at
What happened to Buffalo Bills player Damar Hamlin?