Doctor responds to Elon Musk's tweet about vaccines amid Bronny James' cardiac arrest

Elon Musk tweeted about the side effects of "the vaccine" after news broke that Bronny James, older son of LeBron James, suffered a cardiac arrest during basketball practice at USC. CNN's Erin Burnett is joined by Sports Cardiology Director at Atlantic Health System Dr. Matthew Martinez to respond. #CNN #News

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