1. Department of Environmental Hygiene, Federal Environment Agency, Berlin, Germany
2. Institute of Epidemiology II, Helmholtz Zentrum München, Neuherberg, Germany
3. ACCON GmbH, Greifenberg, Germany
4. Institute of Epidemiology I, Helmholtz Zentrum München, Neuherberg, Germany
5. Environment Science Center, University of Augsburg, Augsburg, Germany