Przywara-Chowaniec, B. (2019) “Echocardiography and 6-Minute Walk Test for Assessing Disease Progression in Systemic Lupus Erythematosus”, Cardiology and Cardiovascular Medicine, 3(4), pp. 221–235. Available at: http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15691 (Accessed: 21 June 2026).