[1] Department of General Surgery,
[2] University Clinic,undefined
[3] University of Cologne,undefined
[4] Germany,undefined
[5] Department of General Surgery,undefined
[6] University Clinic,undefined
[7] University of Essen,undefined
[8] Germany,undefined
[9] Institute of Physiological Chemistry,undefined
[10] University Clinic,undefined
[11] University of Essen,undefined
[12] Germany,undefined
[13] Department of General Surgery,undefined
[14] St. Barbara-Hospital Gladbeck,undefined
[15] Barbarastr. 1,undefined
[16] D-45964 Gladbeck,undefined
[17] Germany (Tel.: +49-2043-278-5400,undefined
[18] Fax: +49-2043-278-5409),undefined