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