1. Institute of General Practice and Primary Care, Chair of General Practice II and Patient-Centredness in Primary Care, Faculty of Health, Witten/Herdecke University, Witten, Germany
2. Institute of General Practice, Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
3. Institute of General Practice, University Medical Center Rostock, Rostock, Germany
4. Department of Clinical Pharmacology, School of Medicine, Faculty of Health, Witten/Herdecke University, Witten, Germany
5. Institute for Health and Nursing Science, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
6. Institute for Health Services and Economics, Centre for Health and Society, Faculty of Medicine, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
7. WG Medical Statistics and IT-Infrastructure, Institute of General Practice, Hannover Medical School, Hannover, Germany