1. Institute and Outpatient Clinic of Occupational Medicine; University Hospital RWTH Aachen; Aachen Germany
2. Institute and Outpatient Clinic for Occupational and Environmental Medicine; Friedrich-Alexander-University Erlangen-Nuremberg; Schillerstrasse 25/29 91054 Erlangen Germany
3. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance Institute; Ruhr-University Bochum (IPA); Bochum Germany
4. Department of Food Chemistry and Toxicology; Institute for Applied Biosciences; Karlsruhe Institute of Technology (KIT); Kaiserstrasse 12 76131 Karlsruhe Germany