1. West-German Centre of Diabetes and Health, Düsseldorf Catholic Hospital Group, 40591 Düsseldorf, Germany
2. inav—Private Institute for Applied Health Services Research GmbH, 10117 Berlin, Germany
3. German Institute for Telemedicine and Healthcare (DITG) GmbH, 40591 Düsseldorf, Germany
4. General Health Insurance Scheme (AOK Rheinland/Hamburg—Die Gesundheitskasse), 40213 Düsseldorf, Germany
5. Institute for Health Services Research and Health Economics, German Diabetes Center, Leibniz Center for Diabetes Research at the Heinrich-Heine-University Düsseldorf, 40225 Düsseldorf, Germany
6. Institute for Health Services Research and Health Economics, Centre for Health and Society, Faculty of Medicine, Heinrich-Heine-University Düsseldorf, 40225 Düsseldorf, Germany
7. German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany
8. Faculty of Medicine, Heinrich-Heine-University Düsseldorf, 40225 Düsseldorf, Germany