Bills safety Damar Hamlin cleared to return after cardiac arrest, vows NFL comeback

Hamlin suffered cardiac arrest during a Bills-Bengals game in January and received CPR on the field.
Hamlin met with three specialists who cleared him to resume full football activities.
Hamlin has made numerous public appearances since his collapse to raise awareness for sudden cardiac arrest.
Hamlin credits lifesaving care he received on the field for giving him a second chance at his NFL career.
Hamlin says "fear is a choice" as he prepares to prove doubters wrong and make an improbable return to the Bills.