1 Intensive Care Department, Hospital Prof. Doutor Fernando da Fonseca, Portugal.
2 Intensive Care Department, Hospital Prof. Doutor Fernando da Fonseca, Portugal. Electronic address: luis.melo@hff.min-saude.pt.
3 Intensive Care Department, Hospital Prof. Doutor Fernando da Fonseca, Portugal; Critical Care University Clinic, Faculty of Medicine, University of Lisbon, Portugal.