To measure FVC and FEV 1 , a Koko spirometer(nSpire Health, Inc; Longmont, California) was used, and the maneuvers were performed according to the guidelines of the American Thoracic Society and European Respiratory Society.
To measure FVC and FEV 1 , a Koko spirometer(nSpire Health, Inc; Longmont, California) was used, and themaneuvers were performed according to the guidelines of theAmerican Thoracic Society and European Respiratory Society.