1. Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Department of Cardiovascular Surgery, Berlin, Germany
2. German Heart Center Berlin, Department of Cardiothoracic and Vascular Surgery, Berlin, Germany
3. German Center for Cardiovascular Research, Partner Site, Berlin, Germany
4. Swiss Federal Institute of Technology (ETH) Zurich, Department of Health Science and Technology, Zurich, Switzerland