Illustration of chronic obstructive pulmonary disease (COPD), a common lung disease where breathing is difficult. There are two main forms of COPD: Chronic bronchitis, whose symptoms include a long-term cough with mucus) (
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Illustration of chronic obstructive pulmonary disease (COPD), a common lung disease where breathing is difficult. There are two main forms of COPD: Chronic bronchitis, whose symptoms include a long-term cough with mucus) (
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