1. Institute of Chemistry, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
2. Department of General and Visceral Surgery, Alfried Krupp Krankenhaus Essen, Essen, Nordrhein-Westfalen 45276, Germany
3. Faculty of Health Sciences, University of Witten/Herdecke, Witten, Nordrhein-Westfalen 58448, Germany