Renin–angiotensin–aldosterone system activation in plasma as marker for prognosis in critically ill patients with COVID-19: a prospective exploratory study. - Krenn, Katharina; Kraft, Felix; Mandroiu, Luana; Tretter, Verena; Reindl-Schwaighofer, Roman; Clement, Theresa; Domenig, Oliver; Vossen, Matthias G.; Riemann, Gregor; Poglitsch, Marko; Ullrich, Roman (Annals of Intensive Care, 2025)