1. Department of Surgery, Cantonal Hospital Baselland , Liestal , Switzerland
2. Department of Gastroenterology and Hepatology, Medical University Clinic, Cantonal Hospital Baselland , Liestal , Switzerland
3. Department of Internal Medicine, Cantonal Hospital Baselland , Liestal , Switzerland
4. Department of Pathology and Molecular Pathology, Institute of Molecular Cancer Research, University Hospital Zurich , Zurich , Switzerland
5. Department of Pathology, Cantonal Hospital Baselland , Liestal , Switzerland
6. Institute of Tissue Medicine and Pathology, University Bern , Bern , Switzerland