1. Division of Anaesthesiology and Perioperative Intensive Care, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria
2. Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057 Zürich, Switzerland
3. Research Institute of Wildlife Ecology, University of Veterinary Medicine, Savoyenstrasse 1, 1160 Vienna, Austria
4. Praxis für Zootiere und Exoten, Kleintierpraxis, Neuwiesenstr. 6, 8610 Uster, Switzerland
5. Equine Hospital, The University of Liverpool, Leahurst, Chester High Road, Neston, South Wirral CH64 7TE, UK