1. GSF, National Research Center for Environment and Health, Institute of Epidemiology, Neuherberg, Germany
2. Ludwig-Maximilians-University of Munich, Institute of Medical Data Management, Biometrics, and Epidemiology, Munich, Germany
3. Environmental and Occupational Health Unit, Institute for Risk Assessment Sciences, Utrecht University, The Netherlands
4. IVU Umwelt GmbH, Sexau, Germany