[1] Charite, Med Oncol, D-13353 Berlin, Germany
[2] Univ Gottingen, Univ Med Ctr, Dept Gen Visceral & Pediat Surg, D-37073 Gottingen, Germany
[3] Sana Klinikum Lichtenberg, Dept Gen & Visceral Surg, Berlin, Germany
[4] Klinikum Augsburg, Dept Gastroenterol, Augsburg, Germany
[5] Univ Hosp Frankfurt, Dept Gen & Visceral Surg, Frankfurt, Germany
[6] Univ Cologne, Dept Gastroenterol & Hepatol, D-50931 Cologne, Germany
[7] Klinikum Nuernberg, Nurnberg, Germany
[8] Univ Med Rostock, Dept Gen Thorac Vasc & Transplantat Surg, Rostock, Germany
[9] Univ Klinikum Carl Gustav Carus, Dept Gen Thorac & Vasc Surg, Dresden, Germany
[10] Klinikum Johannes Gutenberg Univ, Dept Gastroenterol, Mainz, Germany
[11] Potsdam Klinikum, Potsdam, Germany
[12] Charite, Med Oncol, D-13353 Berlin, Germany
[13] Charite, Dept Gen Visceral & Transplantat Surg, Berlin, Germany
[14] Outpatient Dept Hematol Oncol, Friedrichshafen, Germany
[15] Charite, Campus Virchow Klinikum, Internist Onkol, D-13353 Berlin, Germany