1. Department of Gastrointestinal Surgery, Aalborg University Hospital, Aalborg, Denmark
2. Department of General Surgery, Hospital of Vendsyssel, Hjørring, Denmark
3. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
4. Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark
5. Section of Molecular Diagnostics, Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
6. Unit of Clinical Biostatistics and Bioinformatics, Aalborg University Hospital, Aalborg, Denmark