1. Institute for Medical Informatics, Statistics and Documentation, Medical University of Graz, Graz, Austria
2. Institute of General Practice and Evidence-Based Health Services Research, Medical University of Graz, Graz, Austria
3. Institute of General Practice, Family Medicine and Preventive Medicine, Paracelsus Medical University, Salzburg, Austria
4. Center for Public Health, Department of General Practice and Family Medicine, Medical University of Vienna, Vienna, Austria
5. Institute of General Practice and Family Medicine, Munich University Hospital LMU Munich, Munich, Germany
6. Department of General Practice and Health Services Research, University Hospital Heidelberg, Heidelberg, Germany
7. Institute of General Medicine, Medical University of Innsbruck, Innsbruck, Austria
8. Institute of General Practice Charité—Universitätsmedizin Berlin, Berlin, Germany
9. Department of Family Medicine, Medical Faculty, University of Ljubljana, Ljubljana Slovenia
10. Institute of General Practice, Preventive and Rehabilitation Medicine, Philipps-University Marburg, Marburg, Germany
11. Institute of General Practice and Family Medicine of the Medical Faculty, Otto-von-Guericke-University, Magdeburg, Germany
12. Institute of General Practice at the Medical Faculty of Martin Luther University Halle-Wittenberg, Halle-Wittenberg, Germany
13. Institute of General Practice, Goethe University, Frankfurt am Main, Germany
14. Faculty of Medicine University of Maribor, Maribor, Slovenia
15. Institute of General Practice, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen-Nürnberg, Germany
16. Institute of General Practice, School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, Oldenburg, Germany