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Chronic obstructive pulmonary disease - Wikipedia
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Chronic obstructive pulmonary disease - Wikipedia
chronic bronchitis
Why do lungs replace skin as a respiratory surface in vertebrates? - Quora
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COPD: Know the Signs and Symptoms – Pink Puffers and Blue Bloaters
Frequencies of the “pink puffer” and “blue bloater” subtypes of COPD by... | Download Scientific Diagram
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Chronic Bronchitis - "blue bloater" - YouTube
COPD: Know the Signs and Symptoms – Pink Puffers and Blue Bloaters