1. Department of Surgery Haukeland University Hospital Bergen Norway
2. Department of Clinical Medicine University of Bergen Bergen Norway
3. Academic Department of Surgery Queen Elizabeth Hospital Edgbaston Birmingham UK
4. Department of Pathology Haukeland University Hospital Bergen Norway
5. National Centre for Ultrasound in Gastroenterology Department of Medicine Haukeland University Hospital Bergen Norway
6. Department of Surgery A Odense University Hospital Svendborg Denmark
7. Institute of Regional Health Science University of Southern Denmark Odense Denmark