First Department of Internal Medicine Laiko General Hospital National and Kapodistrian University of Athens Athens 11527 Greece;
First Department of Intensive Care School of Medicine National and Kapodistrian University of Athens Athens 10676 Greece;
First Department of Intensive Care School of Medicine National and Kapodistrian University of Athens Athens 10676 Greece;
First Department of Internal Medicine Laiko General Hospital National and Kapodistrian University of Athens Athens 11527 Greece;
First Department of Intensive Care School of Medicine National and Kapodistrian University of Athens Athens 10676 Greece;
First Department of Intensive Care School of Medicine National and Kapodistrian University of Athens Athens 10676 Greece;
First Department of Intensive Care School of Medicine National and Kapodistrian University of Athens Athens 10676 Greece;
SARS-CoV-2; COVID-19; Elderly; Critically ill; Intensive care unit mortality; Respiratory failure;