1. Danish Meat Research Institute, Maglegårdsvej 2, DK-4000 Roskilde, Denmark, Department of Pharmacology and Pathobiology, Royal Danish Veterinary and Agricultural University, Bülowsvej 13, DK-1870 Frederiksberg, Denmark, and Department of Analytical and Pharmaceutical Chemistry, The Royal Danish School of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark