Bilateral paralysis is much less common than unilateral paralysis of the vocal cords.

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In 2011, James Driver was felled by an episode of temporary paralysis that left one of his vocal cords frozen.

WSJ: How to Take Years Off Your Voice

Mr. Page's condition of vocal cord paralysis is caused when one or both of the vocal cords don't open and close correctly, resulting in difficulty speaking or breathing.

WSJ: Google CEO Larry Page Diagnosed With 'Vocal Cord Paralysis'