Yasin, M., Ali Shan, Ghani, U., Nazia Jehanzeb, Sanaullah Tareen and Faheem Jan 2023. Correlation of Arterial and Venous Blood Gases in Patients Presenting with Acute Exacerbation of Chronic Obstructive Pulmonary Disease at Abbottabad. Pakistan Journal of Chest Medicine. 29, 4 (Dec. 2023), 470–476.