1. Department of Anesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
2. Department of Anaesthesiology, German Heart Center Berlin, Humboldt University, Berlin, Germany
3. Department of Cardiovascular Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
4. Department of Cardiovascular Surgery, German Heart Center, Humboldt University, Berlin, Germany