[1] Univ Hosp Hamburg Eppendorf, Dept Gen Visceral & Thorac Surg, D-20246 Hamburg, Germany
[2] Klinikum Bayreuth, Inst Pathol, D-95445 Bayreuth, Germany
[3] Univ Hosp Hamburg Eppendorf, Dept Interdisciplinary Endoscopy, D-20246 Hamburg, Germany
[4] Univ Hosp Hamburg Eppendorf, Inst Pathol, D-20246 Hamburg, Germany
[5] Univ Med Ctr Hamburg Eppendorf, Univ Canc Ctr, Inst Anat & Expt Morphol, D-20246 Hamburg, Germany