1. Department of General Internal Medicine, University Hospital and University of Bern, 3010 Bern, Switzerland
2. Department of Emergency Medicine, University Hospital and University of Bern, 3010 Bern, Switzerland
3. Division of Anesthesiology, Cantonal Hospital of Winterthur, 8400 Winterthur, Switzerland
4. University Institute of Diagnostic, Interventional and Pediatric Radiology, University Hospital and University of Bern, 3010 Bern, Switzerland