[1] Department of General and Trauma Surgery,
[2] Heinrich Heine University,undefined
[3] Moorenstrasse 5,undefined
[4] 40225 Düsseldorf,undefined
[5] Germany,undefined
[6] Department of General and Visceral Surgery,undefined
[7] Center for Surgery,undefined
[8] Klinikum Krefeld,undefined
[9] Germany,undefined
[10] Medical Department II,undefined
[11] Klinikum Aschaffenburg,undefined
[12] Germany,undefined
[13] Coordinating Centre for Clinical Trials,undefined
[14] Heinrich Heine University,undefined
[15] Moorenstrasse 5,undefined
[16] 40225 Düsseldorf,undefined
[17] Germany,undefined