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Asthma - Symptoms and causes - Mayo Clinic
Asthma: Types, Causes, Symptoms, Diagnosis & Treatment
What Is Asthma? - American Lung Association
How might asthma affect the lungs? - Medical News Today
Asthma: Causes, Symptoms, and Treatment - WebMD
How Does Asthma Affect the Respiratory System? - Healthline
About Asthma | Asthma | CDC - Centers for Disease Control and …
Asthma | Asthma Symptoms | Asthma Attack - MedlinePlus
Learn About Asthma - American Lung Association
Asthma - Johns Hopkins Medicine