“The Study of Serum Vitamin D Level In Patient With Pulmonary Hypertension And Right Ventricular Systolic Dysfunction Detected by Transthoracic Echocardiography” (2018) JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences, 26(5), pp. 86–94. Available at: https://www.journalofbabylon.com/index.php/JUBPAS/article/view/863 (Accessed: 3 May 2025).