1. Department of Veterinary Clinical Sciences; The Royal Veterinary College; Hawkshead Lane, North Mymms Hatfield Hertfordshire AL97TA UK
2. Division of Diagnostic Imaging; Faculty of Veterinary Medicine, Utrecht University; Yalelaan 108, 3584 CM Utrecht The Netherlands
3. Department of Veterinary Clinical Sciences; Faculty of Veterinary Medicine, Utrecht University; Yalelaan 108, 3584 CM Utrecht The Netherlands