Wahab, A., Haq, Z.U., Ahmad, W., Ashraf, S., Farooqi, R. and Ullah, R. 2019. Frequency of Gastroesophageal reflux disease in patients with Chronic Obstructive Pulmonary disease admitted to Pulmonology Ward Khyber Teaching Hospital. Pakistan Journal of Chest Medicine. 25, 1 (Mar. 2019), 27–31.