Gonzalez, Filipe, Duarte Martins, Jacobo Bacariza, Rui Gomes, and Antero Fernandes. “Portal Vein Pulsatility, A Better Indicator of Volume Status in COVID-19?”. Cardiology and Cardiovascular Medicine 4, no. 6 (November 20, 2020): 715–717. Accessed June 21, 2026. http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15978.