1. Department of Upper Abdominal Surgery, Center for Digestive Diseases, Karolinska University Hospital, Stockholm, Sweden
2. Division of Surgery, Department of Clinical Science, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
3. Department of Thoracic Surgery, Virginia Mason Medical Center, Seattle, WA, USA
4. Institute of Pathology, Bayreuth, Germany
5. Department of Pathology, Odense University Hospital, Odense, Denmark