1. Institute for Applied Epistemology and Medical Methodology, University of Witten/Herdecke, Zechenweg 6, 79111 Freiburg, Germany
2. Center for Complementary Medicine, Institute for Environmental Health Sciences and Hospital Infection Control, University Medical Center Freiburg, Breisacher Strasse 115B, 79106 Freiburg, Germany
3. Department of Theology, Caritas Sciences, University of Freiburg, Werthmannplatz 3, 79098 Freiburg, Germany