[1] Ruhr Univ Bochum, Knappschaftskrankenhaus, Dept Med, Bochum, Germany
[2] Ruhr Univ Bochum, Inst Pathol, Bochum, Germany
[3] St Josefs Hosp, Dormund Horde, Dortmund, Germany
[4] Ruhr Univ Bochum, Mol Gastrointestinal Oncol, Clin Res Ctr, Bochum, Germany