Breathing exercises
doi: Keywords (Click on any keyword for related articles) emphysema, chronic obstructive pulmonary disease, Lung, smoking, marijuana, tobacco, epidemiology, pulmonary, cross-sectional, respiratory, forced expiratory volume, forced vital capacity, computed tomography scan Images ISSN 2372-952X Copyright & Reprints While the JCOPDF is an open access journal and free access to its content is encouraged, reproduction of JCOPDF content for bulk and commercial distribution/ use must be purchased from the COPD Foundation, sole copyright holder of all JCOPDF content
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