1. Department of Public Health, Faculty of Medicine, Heinrich-Heine-University, Düsseldorf, Germany
2. Institute of Biometrics and Epidemiology, German Diabetes Center at the Heinrich-Heine-University, Leibniz Center for Diabetes Research, Düsseldorf, Germany
3. Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
4. Institute of Health Economics and Health Care Management, Helmholtz Zentrum München, Neuherberg, Germany