Sultan, K. M.; Hussain, M. F.; Ismael, A. A. The Relation of Echocardiographic Findings to Pulmonary Function Tests in Patients With Chronic Obstructive Pulmonary Disease. J Fac Med Baghdad 2009, 51 (1), 17-22. https://doi.org/10.32007/jfacmedbagdad.5111160.