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NBC sports medicine expert breaks down Dale Earnhardt Jr.'s case (video)

Mike Ryan, the NBC Sports medicine analyst discusses Dale Earnhardt Jr.'s concussion and the process going forward.

NBC Sports’ sports medicine analyst Mike Ryan called in to Friday’s edition of NASCAR America to break down Dale Earnhardt Jr.'s concussion-like symptoms and the process going forward.

“Junior made a smart call to not drive,” Ryan said of Earnhardt sitting out Sunday’s New Hampshire 301 at New Hampshire Motor Speedway.

Check out the video.