1 Department of Critical Care Medicine, Hospital Israelita Albert Einstein, São Paulo, Brazil.
2 Department of Intensive Care, Amsterdam University Medical Centers, location 'AMC', Amsterdam, The Netherlands.
3 Department of Cardio-Pulmonary, Division of Pulmonary, Instituto do Coração, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil.