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  1. Asthma - Symptoms and causes - Mayo Clinic

  2. Asthma - Wikipedia

  3. Asthma - World Health Organization (WHO)

  4. Asthma: Types, Causes, Symptoms, Diagnosis & Treatment - Cleveland Clinic

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

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

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

  8. Asthma - StatPearls - NCBI Bookshelf - National Center for ...

  9. Asthma - Diagnosis and treatment - Mayo Clinic

  10. What Is Asthma? | American Lung Association