John Merritt O'Donnell, M.D.Director, Surgical Intensive Care Unit Chairman, Department of Surgical Critical Care, Division of SurgeryLahey Hospital and Medical CenterBurlington, MAUSAFlávio Eduardo Nácul, MD, PhDCritical Care MedicineUniversity HospitalFederal University of Rio de JaneiroSurgical Critical Care MedicinePró-Cardíaco HospitalRio de Janeiro, RJ Brazil