1. Department of Surgery and Anaesthesiology of Domestic Animals; Faculty of Veterinary Medicine, Ghent University; Salisburylaan 133 9820 Merelbeke Belgium
2. Department of Pathology, Bacteriology and Avian Diseases; Faculty of Veterinary Medicine, Ghent University; Salisburylaan 133 9820 Merelbeke Belgium
3. Department of Virology, Parasitology and Immunology; Faculty of Veterinary Medicine, Ghent University; Salisburylaan 133 9820 Merelbeke Belgium