1 Hannover Medical School, Department of Respiratory Medicine and Biomedical Research in End-Stage and Obstructive Lung Disease Hannover, German Center for Lung Research, Hannover, Germany.
2 Institute of Intensive Care Medicine, University Hospital Zurich, Zurich, Switzerland.
3 Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany.
4 Department of Anesthesiology and Intensive Care Medicine, University Hospital Bonn, Bonn, Germany.
5 Institute of Intensive Care Medicine, University Hospital Zurich, Zurich, Switzerland. sascha.david@usz.ch.