1. Institute of Biometrics and Epidemiology, German Diabetes Center, Leibniz Institute at the Heinrich Heine University, Düsseldorf, Germany
2. GSF National Research Center for Environment and Health, Institute of Health Economics and Health Care Management, Neuherberg, Germany
3. University of Ulm Medical Center, Ulm, Germany
4. GSF National Research Center for Environment and Health, Institute of Epidemiology, Neuherberg, Germany