Shomaila.A..A..G..A..H..A. ShomailaAwan, AftabAhmed,MurtazaGondal,AsmaAmbreen,TassawarHussain,IshtiaqAhmad, “Correlation Between FEV1 (Forced Expiratory Volume in First Second) and Pulmonary Arterial Pressure among Patients of Chronic Obstructive Pulmonary Disease”, JRMC, vol. 23, no. 4, Dec. 2018.