1. University of Duisburg-Essen; Department of Internal and Integrative Medicine, Kliniken Essen-Mitte, Faculty of Medicine; Am Deimelsberg 34a Essen Germany 45276
2. University of Technology Sydney; Australian Research Centre in Complementary and Integrative Medicine; 235-253 Jones Street Ultimo Australia 2007
3. University of Duisburg-Essen; Department of Integrative Gastroenterology, Kliniken Essen-Mitte, Faculty of Medicine; Am Deimelsberg 34a Essen Germany 45276