1. Goethe University; Institute of General Practice; Theodor-Stern-Kai 7 Frankfurt am Main Hesse Germany 60590
2. Graz, Austria / Institute of General Practice, Goethe University; Institute of General Practice and Evidence-Based Health Services Research, Medical University of Graz; Frankfurt am Main Austria
3. Medical University of Graz; Institute of General Practice and Evidence-Based Health Services Research / Institute for Medical Informatics, Statistics and Documentation; Auenbruggerplatz 2/9 Graz Austria 8036
4. Medical University of Graz; Institute of General Practice and Evidence-Based Health Services Research / Department of Internal Medicine, Division of Endocrinology and Metabolism; Auenbruggerplatz 2/9 Graz Austria 8036
5. Medical University of Graz; Institute of General Practice and Evidence-Based Health Services Research; Auenbruggerplatz 2/9 Graz Austria 8036
6. Medical University of Graz; Institute for Medical Informatics, Statistics and Documentation; Auenbruggerplatz 2 Graz Austria 8036
7. Medical University of Graz; Department of Internal Medicine; Auenbruggerplatz 15 Graz Austria 8036