1. Department of Large Animal Clinical Sciences, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Box 7018, S‐750 07 Uppsala, Sweden,
2. The National Veterinary Institute, SVA, Box 7073, S‐750 07 Uppsala, Sweden,
3. Department of Pharmacology and Toxicology, Swedish University of Agricultural Sciences, BMC, Box 573, S‐751 23 Uppsala, Sweden,
4. Department of Pharmacology and Toxicology, Swedish University of Agricultural Sciences, BMC, Box 573, S‐751 23 Uppsala, Sweden