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  1. Autism spectrum disorder - Symptoms and causes - Mayo Clinic

  2. Autism (ASD): Symptoms, Causes, Tests, Treatment & More

  3. Autism Spectrum Disorder - National Institute of Mental ...

  4. Autism - World Health Organization (WHO)

  5. Autism spectrum disorder (ASD) | Autism Speaks

  6. What Is Autism? - WebMD

  7. What is Autism? - Autism Research Institute

  8. Autism spectrum - Wikipedia

  9. What is Autism Spectrum Disorder? | CDC

  10. Autism Spectrum Disorder | National Institute of Neurological ...