[1] Umeå University,Department of Diagnostics and Intervention, Surgery
[2] Sahlgrenska University Hospital,Department of Surgery
[3] SSORG - Scandinavian Surgical Outcomes Research Group,Department of Statistics
[4] Sahlgrenska Academy,Department of Molecular Medicine and Surgery
[5] University of Gothenburg,Department of Surgery
[6] Umeå School of Business,Department of Surgery, Faculty of Medicine and Health
[7] Economics and Statistics,Department of Surgery
[8] Umeå University,undefined
[9] Karolinska Institutet,undefined
[10] Ersta Hospital,undefined
[11] Örebro University,undefined
[12] Skåne University Hospital,undefined
[13] Malmö,undefined
[14] Lund University,undefined