1. Divisao de Pneumologia, Instituto do Coracao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil;
2. Interdepartmental Division of Critical Care Medicine, St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada;
3. Department of Internal Medicine, Cleveland Clinic Foundation, Fairview Hospital, Cleveland, Ohio; and
4. Intensive Care Unit, AC Camargo Cancer Center, São Paulo, Brazil