1 Department of Diagnostics and Intervention, Umeå University, Umeå, Sweden.
2 Department of Molecular Medicine and Surgery, Karolinska Institutet, and Department of Surgery, Ersta Hospital, Stockholm, Sweden.
3 Department of Surgery, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
4 Department of Surgery, Skåne University Hospital, Malmö, Lund University, Lund, Sweden.
5 Department of Surgery, Scandinavian Surgical Outcomes Research Group (SSORG), Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.