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  1. Noonan syndrome - Symptoms and causes - Mayo Clinic

  2. Noonan syndrome - Wikipedia

  3. Noonan syndrome - UpToDate

  4. Noonan Syndrome (Leopard Syndrome): Causes & Outlook - Cleveland Clinic

  5. Noonan Syndrome | Children's Hospital of Philadelphia

  6. Noonan Syndrome - StatPearls - NCBI Bookshelf

  7. Noonan Syndrome - St. Jude Children’s Research Hospital

  8. Noonan syndrome - Genetic and Rare Diseases Information Center

  9. Noonan syndrome: MedlinePlus Genetics

  10. Noonan syndrome - Diagnosis and treatment - Mayo Clinic