1. Department of Emergency Medicine, Inselspital, University Hospital Bern, Freiburgstrasse 10, 3010 Bern, Switzerland
2. University Institute of Diagnostic, Interventional and Pediatric Radiology, Inselspital, University Hospital Bern, Freiburgstrasse 10, 3010 Bern, Switzerland
3. Department of General Anesthesiology, Intensive Care and Pain Management, Medical University of Vienna, Waehringerguertel 18-22, 1090 Vienna, Austria