1. Ophthalmology Unit; Vetsuisse Faculty; Equine Department; University of Zurich; Winterthurerstrasse 260 Zurich CH-8057 Switzerland
2. Diagnostic Imaging Unit; Vetsuisse Faculty; Department for Small Animals; University of Zurich; Zurich CH-8057 Switzerland
3. Institute of Veterinary Pathology; Vetsuisse Faculty; University of Zurich; Zurich CH-8057 Switzerland