Helios St. Elisabeth Klinik Oberhausen, Department of Surgery II, University of Witten/Herdecke, Oberhausen, Germany
Helios St. Elisabeth Klinik Oberhausen, Department of Surgery II, University of Witten/Herdecke, Oberhausen, Germany
Copyright © 2016 Mike Ralf Langenbach, Alexandre Berengolts et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.