1. Department of Biomedical Sciences and Cell Systems, section Anatomy and Medical Physiology, University Medical Center Groningen, Groningen, the Netherlands
2. Department of Intensive Care Medicine, University Medical Center Groningen, Groningen, the Netherlands
3. Department of Anesthesiology, University Medical Center Groningen, Groningen, the Netherlands
4. Department of Emergency Medicine, University Medical Center Groningen, Groningen, the Netherlands
5. Department of Cardiothoracic Surgery, University Medical Center Groningen, Groningen, the Netherlands