For Damar Hamlin, first responders' swift response may have been crucial - The Washington Post
What is commotio cordis, which NFL player Damar Hamlin says stopped his heart?
Meet the 'real hero' who saved Damar Hamlin's life: Oklahoma-born assistant trainer Denny Kellington
Take it from Damar: Learning CPR is easy, quick and can save a life
Buffalo Bills' Damar Hamlin partners with American Heart Association for CPR challenge - Good Morning America
Bills' assistant athletic trainer who performed CPR on Damar Hamlin receives one NFL MVP vote
Bills' Damar Hamlin in Critical Condition After Collapsing on Field
Timothy Kremchek: CPR training, AEDs help us all win the game of life
Athletic trainer explains effort to save Damar Hamlin's life