1. WissHom: Research Department, Scientific Society for Homeopathy, Köthen, Germany
2. Department of Medicine I (emeritus), Medical University of Vienna, Vienna, Austria
3. Institute for Homeopathic Research, Vienna, Austria
4. Department of Psychology and Pedagogic Science, St Mary's University, Twickenham, United Kingdom
5. Louis Bolk Institute, Health and Nutrition, Bunnik, The Netherlands
6. WissHom: Scientific Society for Homeopathy, Köthen, Germany
7. Institute of Integrative Medicine, University of Witten/Herdecke, Herdecke, Germany