Shah, Q. ., F. Rabbi, W. A. . Khan, and Shafiullah. “Impact of Proton Pump Inhibitor Therapy for GERD on Acute Exacerbations and Pneumonia Risk in Patients With COPD: A Retrospective Cohort Study”. Pakistan Journal of Chest Medicine, vol. 30, no. 3, Sept. 2024, pp. 364-71, https://pjcm.net/index.php/pjcm/article/view/976.