1 Respiratory Intermediate Care Unit, Hospital General de Agudos Dr Juan A. Fernández, Buenos Aires, Argentina.
2 Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Azienda Ospedaliera-Universitaria, Division of Respiratory and Critical Care, Sant'Orsola Hospital, Bologna, Bologna, Italy.
3 Research Group in Perioperative Medicine, Department of Anesthesiology, Hospital Universitario y Politécnico la Fe, Valencia, Spain.
4 Department of Emergency, Intensive Care Medicine and Anesthesia, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy. Electronic address: dlgrieco@outlook.it.