Brother helps diagnose sister with rare Guillain-Barré syndrome

Kara Dunn was on a Europe trip with friends when she experienced a range of strange symptoms, from terrible headache to feeling like her teeth had fallen out. She was taken to the emergency room, but doctors were mystified. After her brother wrote to his neurology professor at the Mayo Clinic, Kara finally was diagnosed. Kara; her brother, Ryan; their mother; and Dr. Christina Kwasnica join Megyn Kelly to discuss how they solved the medical mystery.