Iqbal, Z., Ullah, Z., Basit, A., Khan, M. Y., & Javaid, A. (2015). CHANGES IN ARTERIAL BLOOD GASES AND RESPIRATORY RATE BEFORE AND AFTER NON INVASIVE POSITIVE PRESSURE VENTILATION IN ACUTE EXACERBATION OF COPD. Pakistan Journal of Chest Medicine, 14(3). Retrieved from https://pjcm.net/index.php/pjcm/article/view/178