[1] Aalborg University Hospital,Department of Surgery
[2] Odense University Hospital,Department of Surgery
[3] Slagelse Hospitals,Department of Surgery
[4] Copenhagen University Hospital Hvidovre,The Research Unit for General Practice and Section of General Practice, Department of Public Health
[5] Optimed,Center for Surgical Science, Department of Surgery
[6] Clinical Research Centre,undefined
[7] University of Copenhagen,undefined
[8] Zealand University Hospital,undefined