1. Division of Diagnostic Imaging, Faculty of Veterinary Medicine; Utrecht University; Yalelaan 110, 3584 CM (Veraa, van den Belt)
2. Department of Pathobiology, Faculty of Veterinary Medicine; Utrecht University; Yalelaan 1, 3584 CL (Bergmann)
3. Department of Equine Sciences, Faculty of Veterinary Medicine; Utrecht University; Yalelaan 114, 3584 CM (Wijnberg, Back) Utrecht The Netherlands
4. Department of Surgery and Anaesthesiology of Domestic Animals, Faculty of Veterinary Medicine; Ghent University; Salisburylaan 133, B-9820 Merelbeke Belgium (Back)