1. Department of Health Services Research Carl von Ossietzky Universität Oldenburg Oldenburg Germany
2. Institute for Health Services Research and Health Economics, Centre for Health and Society, Faculty of Medicine Heinrich‐Heine‐University Düsseldorf Düsseldorf Germany
3. mediStatistica Wuppertal Germany
4. Martin Luther University Halle‐Wittenberg Institute for Health and Nursing Sciences, Medical Faculty Halle (Saale) Germany
5. Department of Nursing Science Uniklinik RWTH Aachen Aachen Germany
6. Department of Health Management AOK Rheinland/Hamburg Düsseldorf Germany
7. Department of Orthopaedics and Trauma Surgery University Hospital Düsseldorf Düsseldorf Germany
8. Institute for Health Services Research and Health Economics, German Diabetes Center Leibniz Center for Diabetes Research at the Heinrich‐Heine‐University Düsseldorf Düsseldorf Germany