1. Faculty of Pharmaceutical Sciences, Laboratory of Food Analysis, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium; TOXI-TEST NV, Harelbekestraat 72, 9000 Ghent, Belgium; and Agricultural Biotechnology Center, Institute for Animal Sciences, Szent-Györgyi Albert u. 4, 2101 Gödöllö, Hungary