1. Department of Radiology, Medical University of Innsbruck, University Clinic–State Hospital of Innsbruck, Anichstraße 35, Innsbruck 6020, Austria.
2. Department of Neuroradiology, Medical University of Innsbruck, Innsbruck, Austria.
3. Department of Surgery, University Hospital for Visceral, Transplant and Thoracic Surgery, Innsbruck, Austria.
4. Department of Surgery, University Hospital for Anaesthesia and Intensive Care, Innsbruck, Austria.