1. Department of Surgery, Skåne University Hospital, Lund, Sweden;
2. Department of Clinical Sciences, Lund University, Lund, Sweden;
3. Department of Surgery, County Council of Östergötland, Linköping, Sweden;
4. Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden;
5. Department of Pathology, Østfold Hospital, Norway