1. Department of Psychology and Psychotherapy, Witten/Herdecke University, Witten, Germany
2. Medical Scientific Services/Medical Affairs, Deutsche Homöopathie-Union DHU-Arzneimittel GmbH & Co. KG, Karlsruhe, Germany
3. Institute of Integrative Medicine, Witten/Herdecke University, Herdecke, Germany
4. Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium