1. Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisuburylaan 133, Merelbeke, Belgium
2. Diagnostic Pathology Laboratory, Dutch Research Institute for Birds and Exotic Animals (NOIVBD), Wintelresedijk 51, Veldhoven, The Netherlands
3. Veterinary Clinic Hoofdstraat, Hoofdstraat 121, Driebergen, the Netherlands
4. Antwerp Zoo, Koningin Astridplein 26, Antwerp, Belgium