1 Department of Surgery, Institute of Clinical Sciences, SSORG - Scandinavian Surgical Outcomes Research Group, Sahlgrenska Academy at University of Gothenburg, Sahlgrenska University Hospital/Östra, Paviljong 11, Journalvägen 14a, 416 50, Gothenburg, Sweden. sofia.erestam@vgregion.se.
2 Department of Surgery, Institute of Clinical Sciences, SSORG - Scandinavian Surgical Outcomes Research Group, Sahlgrenska Academy at University of Gothenburg, Sahlgrenska University Hospital/Östra, Paviljong 11, Journalvägen 14a, 416 50, Gothenburg, Sweden.
3 Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at University of Gothenburg, Sahlgrenska University Hospital/Östra, Diagnosvägen 11, 416 50, Gothenburg, Sweden.