Ashraf, S. et al. 2023. Echocardiography as a Screening Modality for Portopulmonary Hypertension in Patients with Cirrhosis and Chronic Viral Hepatitis. Pakistan Armed Forces Medical Journal. 73, 5 (Oct. 2023), 1279–1283. DOI:https://doi.org/10.51253/pafmj.v73i5.6395.