1Institute of Anaesthesiology, University of Zurich and University Hospital Zurich, Zurich, Switzerland
2Department of Cardiothoracic and Vascular Surgery, German Heart Centre Berlin, Berlin, Germany
3German Centre for Cardiovascular Research, Partner Site Berlin, Berlin, Germany
4Department of Biostatistics at the Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
5Department of Cardiothoracic Surgery, Charité Universitätsmedizin Berlin, Berlin, Germany
6Department of Health Sciences and Technology, Swiss Federal Institute of Technology, Zurich, Switzerland