1. Unit for Colorectal Surgery, Department of Surgery, County Council of Östergötland, 581 85 Linköping, Sweden
2. Division of Surgery, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, 581 83 Linköping, Sweden
3. Unit for Acute Care Surgery and Trauma, Department of Surgery, County Council of Östergötland, 581 85 Linköping, Sweden