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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.
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.
KS&A is the nation's oldest and largest patient education and advocacy organization dedicated to sex chromosome aneuploidy, including 47,XXY (Klinefelter Syndrome).