Before revision:   As the system is intended to be used in a large variety of environments and different patients, we train the algorithm using  the large database of spirometry curves which is the NHANES database by the American National Center for Health Statistics.
After revision:  In contrast to more popular analysis of sound and audio recordings, we fully based our approach on airflow signals only. As the system is intended to be used in a large variety of environments and different patients, we train the algorithm using the large database of spirometry curves which is the NHANES database by the American National Center for Health Statistics.