1. Department of Surgery, Institute of Clinical Sciences, University of Gothenburg, Gothenburg, Sweden
2. Regional Cancer Centre West, Sahlgrenska University Hospital, Gothenburg, Sweden
3. Department of Surgery Skaraborg Hospital, Skaraborgs Sjukhus, Skövde, Sweden
4. Department of Pathology and Genetics, Sahlgrenska University Hospital, Gothenburg, Sweden
5. Sahlgrenska Centre for Cancer Research, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden