1. Institute of General Practice (ifam), Patient-Physician-Communication Unit, Centre for Health and Society (chs), Medical Faculty and University Hospital of the Heinrich-Heine-University, Düsseldorf, Germany
2. Institute of General Practice (ifam), Centre for Health and Society (chs), Medical Faculty and University Hospital of the Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
3. Department of Health Promotion, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, The Netherlands
4. Institute of General Practice, Philipps-University Marburg, Marburg, Germany