“…The severity of COPD was both conventionally calculated based on spirometry to classify the severity of airflow limitation (GOLD 1-4) and further the classified according to new risk assessment classification for COPD combining symptoms and exacerbation (GOLD A-B-C-D) in accordance with the criteria of the GOLD Guidelines for COPD [27]. At entry to the study, an assessment was made by the Epital e-Doctors Coordination Center by video-conference, a spirometer, a pulse oximeter and a Medical Acute Box [5].…”