[1] Aarhus Univ Hosp, Dept Radiol, Aarhus, Denmark
[2] Reg Hosp Randers, Dept Surg, Randers, Denmark
[3] Aarhus Univ, Dept Publ Hlth, Res Unit Biostat, Aarhus, Denmark
[4] Royal Marsden NHS Fdn Trust, Dept Radiol, London, England
[5] Aarhus Univ Hosp, Dept Surg, Aarhus, Denmark