1. Institute for Social Medicine, Epidemiology and Health Economics, Charité Universitätsmedizin Berlin, Berlin, Germany
2. Department of Pediatric Gastroenterology, Medical University Poznan, Poznan, Poland
3. Department of Psychology, Universität Witten-Herdecke, Witten, Germany
4. Change Health Science Institute, Berlin, Germany
5. Central Council for Research in Homoeopathy, New Delhi, India
6. National Centre for Integrative Medicine (NCIM), Litfield Medical Centre, Bristol, United Kingdom
7. Institute of Integrative Medicine, Universität Witten-Herdecke, Witten, Germany