Iftikhar Ali Kakar, Abdul Baqi, Nasir Azim, Waqas Ahmad, Zeeshan Shaukat, Khalid Shahab 2023. Frequency of Gastroesophageal Reflux Disease in Chronic Obstructive Pulmonary Disease Patients. Pakistan Journal of Medical & Health Sciences. 16, 12 (Feb. 2023), 397. DOI:https://doi.org/10.53350/pjmhs20221612397.