1. Department of Surgery, Groningen, The Netherlands
2. Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
3. Department of Gastroenterology and Hepatology, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands
4. Department of Biological Imaging and Institute for Medical and Biological Imaging, Technische Universität München and Helmholtz Zentrum München, Munich, Germany