[1] Univ Heidelberg Hosp, Natl Ctr Tumor Dis, Heidelberg, Germany
[2] Heidelberg Univ, Dept Surg, Heidelberg, Germany
[3] Heidelberg Univ, Dept Radiooncol, Heidelberg, Germany
[4] Heidelberg Univ, Dept Surg, Natl Ctr Tumor Dis, Heidelberg, Germany
[5] Stadt Kliniken Bielefeld Mitte, Dept Radiooncol, Bielefeld, Germany
[6] Stadt Kliniken Bielefeld Mitte, Dept Surg, Bielefeld, Germany
[7] Mauriziano Hosp, Unit Hepatobiliary Pancreat Surg, Turin, Italy
[8] Univ Hosp Regensburg, Dept Surg, Regensburg, Germany