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  1. Down syndrome - Symptoms and causes - Mayo Clinic

  2. Down Syndrome | Birth Defects | CDC - Centers for Disease ...

  3. Down Syndrome: Symptoms & Causes - Cleveland Clinic

  4. Down syndrome - Wikipedia

  5. About Down Syndrome | National Down Syndrome Society

  6. Down Syndrome: Facts, Statistics, and You - Healthline

  7. Down syndrome - Diagnosis and treatment - Mayo Clinic