[1] Univ Munich, Klinikum Grosshadern, Dept Internal Med 3, D-80539 Munich, Germany
[2] Univ Cologne, Dept Gastroenterol & Hepatol, D-50931 Cologne, Germany
[3] Klinikum Magdeburg, Dept Hematol Oncol, Magdeburg, Germany
[4] Heidelberg Univ, Dept Surg, Heidelberg, Germany
[5] Krankenhaus Lutherstadt Wittenberg, Dept Internal Med, Lutherstadt Wittenberg, Germany
[6] Klinikum Bayreuth, Dept Internal Med 4, Bayreuth, Germany
[7] Univ Munich, Dept Pathol, Munich, Germany
[8] Univ Munich, Klinikum Grosshadern, Dept Med Oncol, D-80539 Munich, Germany