1 Department of Emergency, Intensive Care Medicine and Anesthesia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy. dlgrieco@outlook.it.
2 Department of Anesthesiology and Intensive Care Medicine, Catholic University of The Sacred Heart, Fondazione 'Policlinico Universitario A. Gemelli' IRCCS, L.go F. Vito, 00168, Rome, Italy. dlgrieco@outlook.it.
3 Department of Medicine, Section of Pulmonary and Critical Care, University of Chicago, Chicago, IL, USA.
4 Department of Emergency, Intensive Care Medicine and Anesthesia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.
5 Department of Anesthesiology and Intensive Care Medicine, Catholic University of The Sacred Heart, Fondazione 'Policlinico Universitario A. Gemelli' IRCCS, L.go F. Vito, 00168, Rome, Italy.