Chronic obstructive pulmonary disease (often called “COPD”) is one of the most important diseases of the 21st century, being a major cause of death and disability. COPD is a common, preventable, and treatable disease characterized by persistent respiratory symptoms and airflow limitation that is not fully reversible. The airflow limitation …

Chronic obstructive pulmonary disease (often called “COPD”) is one of the most important diseases of the 21st century, being a major cause of death and disability. COPD is a common, preventable, and treatable disease characterized by persistent respiratory symptoms and airflow limitation that is not fully reversible. The airflow limitation …