1 Department of Respiratory Medicine, Hannover Medical School and Member of the German Centre for Lung Research, Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Hannover, Germany.
2 Department of Anesthesiology and Intensive Care Medicine, University Hospital Bonn, Bonn, Germany.
3 Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
4 Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.
5 Institute of Intensive Care Medicine, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland. sascha.david@usz.ch.