1. Epidemiology, University Hospital Augsburg, University of Augsburg, 86156 Augsburg, Germany
2. Institute of Epidemiology, Helmholtz Zentrum München—German Research Center for Environmental Health (GmbH), 85764 Neuherberg, Germany
3. Chair of Epidemiology, Institute for Medical Information Processing, Biometry and Epidemiology, Medical Faculty, Ludwig-Maximilians-Universität München, 81377 Munich, Germany
4. German Center for Diabetes Research (DZD), 85764 Neuherberg, Germany
5. KORA Study Centre, University Hospital Augsburg, 86156 Augsburg, Germany
6. Institute of Laboratory Medicine, Medical Faculty, Ludwig-Maximilians-Universität München, 81377 Munich, Germany