[1] Univ Canc Ctr Frankfurt, Inst Klin Onkol Forsch Krankenhaus Nordwest, Frankfurt, Germany
[2] Rems Murr Klinikum Winnenden, Winnenden, Germany
[3] Krankenhaus Nordwest GmbH, Allgemein Viszeral & Minimal Invas Chirurg, Frankfurt, Germany
[4] Univ Hosp Frankfurt, Dept Gen & Visceral Surg, Frankfurt, Germany
[5] Univ Hosp Frankfurt, Frankfurt, Germany
[6] DONAUISAR Klinikum Deggendorf, Deggendorf, Germany
[7] EV Waldkrankenhaus, Berlin, Germany
[8] Klinikum Wolfsburg, Med Klin 2, Wolfsburg, Germany
[9] Univ Klinikum, Klin Gastroenterol Hepatol & Infektiol, Magdeburg, Germany
[10] Katharinenhospital, Klinikum Stuttgart, Klin Allgemeine Innere Med Gastroenterol Hepatol, Stuttgart, Germany
[11] Onkol Schwerpunktpraxis Celle, Celle, Germany
[12] Agaples Markus Hosp, Frankfurt, Germany
[13] Augusta Kranken Anstalt, Bochum, Germany
[14] Gemeinschaftspraxis Hamatol & Onkol Munster, Munster, Germany
[15] Klinikum Nurnberg Paracelsus Med Privatuniv, Nurnberg, Germany