NFL's chief medical officer says all possible causes of Hamlin's cardiac arrest are being investigated

3 years ago 20

• Hamlin shows 'signs of improvement' while still in ICU in critical condition, Bills say • Video: Why this Pro Football Hall of Famer won't let his grandson play the game • Opinion: I've been on the field for two football tragedies. I hope Hamlin's marks a turning point

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3. NFL's chief medical officer says all possible causes of Hamlin's cardiac arrest are being investigated