1. Department of Cardiothoracic Surgery and Anaesthesia, Uppsala University Hospital, Uppsala, Sweden;
2. Department of Surgical Sciences, Section of Thoracic Surgery, Uppsala University, Uppsala, Sweden;
3. Department for Cardiothoracic and Vascular Surgery, Deutsches Herzzentrum Berlin, Berlin, Germany;
4. Berlin Institute of Health, Berlin, Germany;
5. Department of Cardiology and Clinical Physiology, Uppsala University Hospital, Uppsala, Sweden;
6. Uppsala Clinical Research Centre, Uppsala, Sweden