1. Department of Pathobiology, Faculty of Veterinary Medicine; Utrecht University; Utrecht the Netherlands
2. Department of Pathology, Bacteriology and Poultry Diseases; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
3. Department of Large Animal Internal Medicine; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
4. Department of Comparative Physiology and Biometrics; Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium