1Department of Anesthesiology and Critical Care, Hospital Clínic, Institut D’investigació August Pi i Sunyer, Barcelona, Spain
2CIBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
3Department of Preventive Medicine and Public Health, University of Navarra, Pamplona, Spain
4Ubikare Technology, Vizcaya, Spain
5Department of Anesthesiology and Critical Care, Hospital Universitario Río Hortega, Valladolid, Spain
6Department of Anesthesiology and Critical Care, Hospital del Mar, Barcelona, Spain
7Department of Anesthesiology and Critical Care, Hospital Universitario La Princesa, Madrid, Spain
8Department of Anesthesiology and Intensive Care, Clínica Universitaria de Navarra, Pamplona, Spain
9Department of Anesthesiology and Critical Care, Hospital Universitario La Paz, Madrid, Spain
10Department of Anesthesiology and Critical Care, Hospital Universitario de Cruces, Barakaldo, Spain
11Department of Anesthesiology and Critical Care, Hospital Universitario Ramón y Cajal, Madrid, Spain
12Department of Respiratory Care, Massachusetts General Hospital, Boston, USA
13Multidisciplinary Organ Dysfunction Evaluation Research Network, Research Unit, Hospital Universitario Dr Negrin, Las Palmas de Gran Canaria, Spain
14Intensive Care Unit, Hospital Universitario La Princesa, Madrid, Spain