1. Institute of Animal Pathology, Vetsuisse Faculty, University of Berne, Laenggassstr. 122, CH-3001 Berne, Switzerland.
2. Institute of Neuropathology NeuroCenter, Vetsuisse Faculty, University of Berne, Bremgartenstr. 109a, Postfach 8466, CH-3001 Berne, Switzerland.
3. Department of Clinical Veterinary Medicine, Division of Clinical Neurology, Vetsuisse Faculty, University of Berne, Laenggassstr. 128, CH-3012 Berne, Switzerland.
4. Clinic for Ruminants, Vetsuisse Faculty, University of Berne, Bremgartenstr. 109a, CH-3012 Berne, Switzerland.