1 Medical Intensive Care Unit, Medical Emergencies Discipline, Internal Medicine Department, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil. brunobesen@yahoo.com.br.
2 Oncological Intensive Care Unit, Hospital São Luiz Itaim, São Paulo, Brazil. brunobesen@yahoo.com.br.
3 Oncological Intensive Care Unit, Hospital São Luiz Itaim, São Paulo, Brazil.
4 Intensive Care Unit, A.C. Camargo Cancer Center, São Paulo, Brazil.
5 Surgical Intensive Care Unit, Surgery Department, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil.