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KCAL-TV meteorologist Alissa Carlson describes what happened before she fainted on live TV

KCAL-TV meteorologist Alissa Carlson was diagnosed with vasovagal syncope after fainting on live TV. She joins "CBS Mornings" for a closer look at what happened. CBS News chief medical correspondent Dr. Jon LaPook also joins to discuss Alissa's medical condition, which affects millions of Americans.
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