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  1. Down Syndrome - NICHD - Eunice Kennedy Shriver National …

  2. What causes Down syndrome? | NICHD - NICHD - Eunice Kennedy …

  3. Down Syndrome | NICHD - NICHD - Eunice Kennedy Shriver …

  4. What conditions or disorders are commonly associated with Down …

  5. What are the symptoms of Down syndrome? - NICHD

  6. About Klinefelter Syndrome (KS) | NICHD - NICHD - Eunice …

  7. What are common symptoms of Klinefelter syndrome (KS)?

  8. About Intellectual and Developmental Disabilities (IDDs)

  9. Klinefelter Syndrome (KS) - NICHD - Eunice Kennedy Shriver …

  10. How do health care providers diagnose Down syndrome?