1. 1st Department of Medicine, Christian Albrechts University of Kiel Medical School, Kiel, Germany
2. Department of Clinical Research/Respiratory, Boehringer Ingelheim Pharma KG, Birkendorfer Strasse 65, Biberach, 88397, Germany
3. Department of Anaesthesiology, Section of Pathophysiology and Process Development, University of Ulm, Ulm, Germany
4. Consultant, Biberach, Germany