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  1. Asthma - Symptoms and causes - Mayo Clinic

  2. Asthma - World Health Organization (WHO)

  3. Asthma | CDC - Centers for Disease Control and Prevention

  4. Asthma: Types, Causes, Symptoms, Diagnosis & Treatment

  5. Asthma - What Is Asthma? | NHLBI, NIH

  6. Asthma: Causes, Symptoms, and Treatment - WebMD

  7. Asthma - Diagnosis and treatment - Mayo Clinic

  8. Asthma - Wikipedia

  9. What Is Asthma? | American Lung Association

  10. Asthma Clinic - Overview - Mayo Clinic