1. Universitätsmedizin Göttingen; Institut für Arbeits-, Sozial- und Umweltmedizin; Waldweg 37B 37073 Göttingen
2. Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine; University of Erlangen-Nuremberg; Schillerstrasse 25/29 91054 Erlangen Germany
3. Department of Food Chemistry and Toxicology; Institute for Applied Biosciences; Karlsruhe Institute of Technology (KIT); Kaiserstrasse 12 76131 Karlsruhe Germany