1. Institute of General Practice and Interprofessional Care, University Hospital Tübingen, Tübingen, Germany
2. Robert Bosch Center for Integrative Medicine and Health, Bosch Health Campus, Stuttgart, Germany
3. Department of Sociology, University of Konstanz, Konstanz, Germany
4. Medical Care Center of Recura Clinics, Beelitz-Heilstätten, Germany
5. National Centre for Naturopathic Medicine, Southern Cross University, Lismore, NSW, Australia