1. Departamento de Medicina Intensiva, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago Centro, Santiago 8330074, RM, Chile
2. Hospital Clinico UC-CHRISTUS, Pontificia Universidad Católica de Chile, Santiago Centro, Santiago 8330024, RM, Chile
3. Department of Intensive Care, Erasmus MC University Medical Center, P.O. Box 2040, 3000 Rotterdam, The Netherlands
4. Department of Pulmonology and Critical Care, Columbia University Medical Center, New York, NY 10019, USA
5. NYU School of Medicine, Langone, New York, NY 10016, USA