1 Institute of Animal Nutrition, Nutrition Diseases and Dietetics, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany.
2 Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Hannover, Germany.
3 Department Safety in the Food Chain, German Federal Institute for Risk Assessment, Berlin, Germany.
4 Institute of Animal Nutrition, Nutrition Diseases and Dietetics, Faculty of Veterinary Medicine, Leipzig University, Leipzig, Germany. ingrid.vervuert@vetmed.uni-leipzig.de.