Acknowledgement

This work was supported by KARL STORZ SE & Co. KG, Tuttlingen, Germany, which provided us laparoscopic equipment and technical assistance. We wish to thank Dr. Katrin Roth (Core Facility for Microscopy, Institute of Molecular Biology and Tumor Research / Center for Tumor and Immunobiology, Marburg University Medical Center) for support in wide field microscopy. We thank Dörthe Sönnecken (Department of Pediatric Surgery, University Hospital Marburg), Viktoria Wischmann and Mareike Maier (Department of Pathology, Marburg University Medical Center) for technical assistance in the experiments.