Ahmed, C. M., Arafat, S. M., Hasan, M. K., Khan, A. H., Sayami, L. A., Uddin Sultan, M. A., Hoque, M. H., & Mahmood, M. (2012). Validity of Estimation of Pulmonary artery Pressure Using Continuous wave Doppler Echocardiography in Patient with Patent Ductus Arteriosus (PDA). University Heart Journal, 7(1), 10–12. https://doi.org/10.3329/uhj.v7i1.10202