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KS&A is the nation's oldest and largest patient education and advocacy organization dedicated to sex chromosome aneuploidy, including 47,XXY (Klinefelter Syndrome).
The Hormone Foundation's mission is to serve as a resource for the public by promoting the prevention, treatment, and cure of hormone-related diseases.
National Institutes of Health (NIH)
NIH is an Agency under the U.S. Department of Health and Human Services, and offers health information and scientific resources.