1. Department of Medical Informatics, Biometry and Epidemiology; Friedrich-Alexander-University Erlangen/Nürnberg; D-91054 Erlangen Germany
2. Lower Saxony State Office for Consumer Protection and Food Safety; Institute for Consumer Products; D-21339 Lüneburg Germany
3. Berlin-Brandenburg State Laboratory; D-10557 Berlin Germany
4. State Office for Agriculture, Food Safety and Fisheries Mecklenburg-Vorpommern; D-18059 Rostock Germany