1. Department of Large Animal Sciences, Medicine and Surgery, Faculty of Health and Medical Sciences; University of Copenhagen; 2630 Tåstrup Denmark
2. Department of Large Animal Sciences; Veterinary Epidemiology; 1870 Frederiksberg Denmark
3. the Department of Companion Animal Clinical Studies; Faculty of Veterinary Science; University of Pretoria; Private Bag X04 0110 Onderstepoort South Africa
4. Department of Small Animal Clinical Sciences, Central laboratory; 1870 Frederiksberg Denmark