Affiliation: | (1) Department of General Surgery, University Hospitals Essen, Hufelandstrasse 55, D-45 147 Essen, Germany Fax: + 49 201 723 5946, DE;(2) Department of Surgery, University Hospital Eppendorf Hamburg, Martinistrasse 52, D-20 246 Hamburg, Germany, DE;(3) Institute of Pathology, Essen-Mitte Hospital, P. O. Box 102151 D-45201 Essen Germany, DE |