[1] Univ Heidelberg, Natl Ctr Tumor Dis, Heidelberg, Germany
[2] Univ Heidelberg Hosp, Dept Surg, Heidelberg, Germany
[3] Tech Univ Munich, Dept Surg, Munich, Germany
[4] Klinikum Braunschweig, Med Klin 3, Braunschweig, Germany
[5] Tech Univ Munich, Dept Pathol, Munich, Germany