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  1. COPD and Coughing: Why Your Pulmonologist May Teach You …

  2. COPD and Cough: What You Need to Know - WebMD

  3. Cough with COPD: What's Normal?

  4. Clinical issues of mucus accumulation in COPD - PMC

  5. Productive Cough: What Can Cause It? - WebMD

  6. Coughing and Mucus Production with COPD

  7. The Burden of Cough and Phlegm in People With COPD: A COPD ...