1. German Research Center for Environmental Health (GmbH), Research Unit Analytical BioGeoChemistry,; Helmholtz Zentrum München; Method development; 85764 Neuherberg Ingolstädter Landstraße 1 Germany
2. Institute for Reference Materials and Measurements; European Commission - Joint Research Centre; External verification; 2440 Geel Retieseweg 111 Belgium
3. Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine; Friedrich-Alexander University Erlangen-Nürnberg (FAU); External verification and chair of the working group “Analyses in Biological Materials“, Deutsche Forschungsgemeinschaft; 91054 Erlangen Henkestr. 9-11 Germany
4. Institute of Applied Biosciences, Department of Food Chemistry and Toxicology; Karlsruhe Institute of Technology (KIT); Chair of the Permanent Senate Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area, Deutsche Forschungsgemeinschaft; 76131 Karlsruhe Adenauerring 20a, Geb. 50.41 Germany