1. Department of Surgery and Physiology and Cardiovascular Research Centre, Faculty of Medicine, University of Porto, Porto, Portugal
2. Department of Anaesthesiology, São João Hospital Centre, Porto, Portugal
3. Department of Cardiovascular Physiology, Ruhr University Bochum, Germany
4. Department of Physiology, Institute for Cardiovascular Research, VU University Medical Centre, Amsterdam, The Netherlands
5. Institute of Physiology 2, University of Muenster
6. Department of Cardiothoracic Surgery, São João Hospital Centre, Porto, Portugal