1. Department of Medical Microbiology; School of Medicine; Vrije Universiteit; Van der Boechorststraat 7 1081 BT Amsterdam The Netherlands
2. Artis Zoo; Plantage Kerklaan 38 1018 CZ Amsterdam The Netherlands
3. Ziekenhuiscentrum Apeldoorn; Postbus 9014 7300 DS Apeldoorn The Netherlands
4. BOA Foundation; Fabrieksstraat 8a 7311 GL Apeldoorn The Netherlands
5. Department of Pathology; Faculty of Veterinary Medicine; Utrecht University; 3508 TD Utrecht The Netherlands