Sumedi ., Philip K, Hafizurrachman M. The effect of Pursed Lips Breathing Exercises on the Oxygen Saturation Levels of Patients with Chronic Obstructive Pulmonary Disease in Persahabatan Hospital, Jakarta. KLS [Internet]. 2021Mar.15 [cited 2023Jun.7];6(1):35-4. Available from: https://knepublishing.com/index.php/KnE-Life/article/view/8589