1. Neurology and Neurosurgery Service, Memvet Referral Center, Palma de Mallorca, Spain
2. Small Animal Hospital, School of Veterinary Medicine, University of Glasgow, Scotland
3. Hospital Veterinari Canis, Girona, Spain
4. Hospital for Small Animals, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, Scotland
5. Chestergates Veterinary Specialists, Chester, UK
6. Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany
7. Anaesthesia and Analgesia Service, Memvet Referral Center, Palma de Mallorca, Spain
8. Departamento de Sanidad y Anatomía Animal, Universidad Autónoma de Barcelona, Barcelona, Spain
9. Department of Veterinary Science, Small Animal Teaching Hospital, University of Liverpool, Neston, UK