No history of spirometry results with confirmed airflow obstruction (fev1/fvc < 70%) and present spirometry is >= 70%
no history of spirometry results with confirmed airflow obstruction (fev1/fvc < 70%) and present spirometry is >= 70%
No history of spirometry results with confirmed airflow obstruction (fev1/fvc < 70%) and present spirometry is >= 70%
no history of spirometry results with confirmed airflow obstruction (fev1/fvc < 70%) and present spirometry is >= 70%