Comparative Study of Flutter Device and Active Cycle of Breathing Technique in Airway Clearance in Subjects with Chronic Obstructive Pulmonary Disease. IJPOT [Internet]. 2020 Jul. 22 [cited 2026 May 9];14(3):232-8. Available from: https://www.medicopublication.com/index.php/ijpot/article/view/9700