Where is the imperceptible difference?

Affiliations

• ¹ Institute of Intensive Care Medicine, University Hospital of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.
• ² Department of Respiratory Medicine and Biomedical Research in End-Stage and Obstructive Lung Disease Hannover, Hannover Medical School and German Center for Lung Research, Hannover, Germany.
• 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 of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland. sascha.david@usz.ch.