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Sputum: Definition, colors, causes, and when to see a doctor
Coughing Up Phlegm: Causes and Treatment - Cleveland Clinic
Sputum: Contents, Function, Conditions, Colors - Verywell Health
Phlegm Color Chart: What the Color of Your Phlegm Means
Sputum - Wikipedia
Bronchitis - Symptoms and causes - Mayo Clinic
Sputum Culture: What Is Sputum? - Cleveland Clinic
Coughing Up Phlegm: Causes and Treatment Options
Understanding Mucus in Your Lungs | American Lung Association
Phlegm: Causes, Color, and Treatment - Health