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CNN's Sanjay Gupta interviews Dr. Betsy Nabel, the NFL's first medical adviser.
CNN's Sanjay Gupta interviews Dr. Betsy Nabel, the NFL's first medical adviser.

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    NFL Chief Health and Medical Adviser on concussions

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NFL Chief Health and Medical Adviser on concussions

Dr. Elizabeth Nabel, the NFL's first Chief Health and Medical Adviser, sits down with CNN's Dr. Sanjay Gupta to discuss the concussion crisis in football

NFL Chief Health and Medical Adviser on concussions

Dr. Elizabeth Nabel, the NFL's first Chief Health and Medical Adviser, sits down with CNN's Dr. Sanjay Gupta to discuss the concussion crisis in football