Ayşe ERDEN, et al. “MR Angiography of Esophageal Mural Veins in Portal Hypertension: A Correlation With Endoscopic Grades of Esophageal Varices”. Turkish Journal of Gastroenterology, vol. 21, no. 3, July 2019, pp. 275-9, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/2338.