1. Helmholtz Zentrum München; German Research Center for Environmental Health, Research Unit Analytical BioGeoChemistry; Neuherberg Germany
2. Institute for Occupational and Environmental Medicine; Johannes Gutenberg-University Mainz; Mainz Germany
3. Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine; University of Erlangen-Nuremberg; Schillerstrasse 25/29 91054 Erlangen Germany
4. Analytisch-biologisches Forschungslabor München; ABF GmbH; München Germany
5. Department of Food Chemistry and Toxicology; Institute for Applied Biosciences; Karlsruhe Institute of Technology (KIT); Kaiserstrasse 12 76131 Karlsruhe Germany