Genetics Home Reference staff is unable to answer specific medical questions or provide personalized information or advice. You should consult with a qualified healthcare professional for answers to your personal health questions.

For questions about genetics, you may also wish to contact the Genetic and Rare Diseases Information Center (GARD), a free service of the National Institutes of Health. GARD can be reached at (888) 205-2311 (toll-free) or online at

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