Medical Faculty, Department of Cardiology, Pulmonology and Vascular Medicine, Heinrich-Heine-University Duesseldorf, Moorenstraße 5, 40225, Duesseldorf, Germany. christian.jung@med.uni-duesseldorf.de. Department of Intensive Care, Aarhus University Hospital, Aarhus, Denmark. Medical Faculty, Department of Cardiology, Pulmonology and Vascular Medicine, Heinrich-Heine-University Duesseldorf, Moorenstraße 5, 40225, Duesseldorf, Germany. Department of Cardiology, Paracelsus Medical University, Salzburg, Austria. Department of Intensive Care Medicine, CIBER Enfermedades Respiratorias, Corporacion Sanitaria Universitaria Parc Tauli, Autonomous University of Barcelona, Sabadell, Spain. Department of Acute Medicine, Geneva University Hospitals, Geneva, Switzerland. Department of Intensive Care Medicine, Inselspital, Universitätsspital, University of Bern, Bern, Switzerland. Department of Medical Intensive Care, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel. General Intensive Care Unit, Hadassah University Medical Center, Jerusalem, Israel. Center for Intensive Care and Perioperative Medicine, Jagiellonian University Medical College, Krakow, Poland. 2nd Department of Anesthesiology and Intensive Care, Medical University of Lublin, Staszica 16, 20-081, Lublin, Poland. Division of Intensive Care and Emergency Medicine, Department of Internal Medicine, Medical University Innsbruck, Innsbruck, Austria. Department of Intensive Care 1K12IC, Ghent University Hospital, Ghent, Belgium. Intensive Care Unit General Hospital of Larissa, Larissa, Greece. Department of Anaesthesia and Intensive Care, Ålesund Hospital, Ålesund, Norway. Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway. Unidade de Cuidados Intensivos Neurocríticos E Trauma. Hospital de São José, Centro Hospitalar Universitário de Lisboa Central, Faculdade de Ciências Médicas de Lisboa, Nova Médical School, Lisbon, Portugal. General Intensive Care, St George's University Hospital NHS Foundation Trust, London, UK. Sorbonne Universités, UPMC Univ Paris 06, INSERM, UMR_S 1136, Institut Pierre Louis d'Epidémiologie et de Santé Publique, Equipe: épidémiologie hospitalière qualité et organisation des soins, 75012, Paris, France. Assistance Publique - Hôpitaux de Paris, Hôpital Saint-Antoine, service de réanimation médicale, 75012, Paris, France. Department of Intensive Care Medicine, University Medical Center, University Utrecht, Utrecht, The Netherlands. Department of Clinical Medicine, University of Bergen, Department of Anaestesia and Intensive Care, Haukeland University Hospital, Bergen, Norway.