1. Karl and Veronica Carstens-Foundation, D-Essen, Germany
2. Department of Agro-Environmental Science and Technology, Faculty of Agriculture, Bologna University, I-Bologna, Italy
3. Interuniversity College for Health and Development, A-Graz, Austria
4. Institute of General Practice, Technical University, D-Munich, Germany
5. Department of Complementary and Integrative Medicine, University of Duisburg-Essen, D-Essen, Germany
6. International Institute of Biophysics, D-Neuss, Germany
7. Institute for Social Medicine, Epidemiology and Health Economics, Charité University Medical Center, D-Berlin, Germany
8. Institute of Complementary Medicine KIKOM, University of Bern, CH-Bern, Switzerland