Chronic Obstructive Pulmonary Disease (COPD)
Approximately 20 million Americans have asthma Nine million of these cases occurred in children under the age of 18 From 1980 to 1994, prevalence.
Chronic Obstructive Pulmonary Disease (COPD). COPD is characterized by : **Chronic airflow obstruction & accelerated loss of lung function which is progressive.
Asthma in the United states
