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  1. Asthma - Symptoms and causes - Mayo Clinic

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

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

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

  5. Asthma - Diagnosis and treatment - Mayo Clinic

  6. Asthma - World Health Organization (WHO)

  7. What Is Asthma? | American Lung Association

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

  9. Asthma - Wikipedia

  10. Asthma: Symptoms, Treatment, and More - Healthline