Dimopoulos, G. Sakelliou, A. Flevari, A. Tzannis, K. Giamarellos-Bourboulis, E.J., Ferritin levels in critically ill patients with covid-19: A marker of outcome?, Πνεύμων=: Pneumon, (34), 2021, SELP Sellier European Law Publishers, 1105848x