Fernando G Zampieri1,2, Juliana C Ferreira1,3,4. 1. Brazilian Research in Intensive Care Network, São Paulo, Brazil. 2. HCor Research Institute, São Paulo, Brazil. 3. Divisao de Pneumologia, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, Brazil. 4. Intensive Care Unit, AC Camargo Cancer Center, São Paulo, Brazil.