1. Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine; University of Saskatchewan; Saskatoon SK S7N5B4 Canada
2. Unit of Diagnostic Imaging, Department of Small Animals and Horses; University of Veterinary Medicine; Vienna 1210 Vienna Austria
3. Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences; Colorado State University; Fort Collins Colorado
4. Department of Clinical Sciences; College of Veterinary Medicine Cornell University; Ithaca New York
5. Tierärztliche Klinik; Grasweg 2 86459 Gessertshausen Germany
6. Department of Veterinary Clinical Sciences; Ohio State University; Columbus Ohio
7. Clinic for Diagnostic Imaging, Vetsuisse Faculty; University of Zurich; Winterthurerstrasse 285c, 8057 Zurich Switzerland
8. Clinic for Horses; University of Veterinary Medicine Hannover, Foundation; Buenteweg 9 30559 Hannover Germany