1. Shock, Organ Dysfunction, and Resuscitation Research Group, Vall d’Hebron Research Institute, Barcelona, Spain
2. Department of Intensive Care, Vall d’Hebron Hospital, Barcelona, Spain
3. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias, Madrid, Spain
4. Centro Hospitalar de Lisboa Ocidental - Polyvalent Intensive Care Unit, Hospital de S.Francisco Xavier, Lisboa, Portugal
5. NOVA Medical School, CHRC, New University of Lisbon, Lisbon, Portugal
6. Center for Clinical Epidemiology and Research Unit of Clinical Epidemiology, OUH Odense University Hospital, Odense, Denmark