1. Equine Department; Section of Ophthalmology; Vetsuisse Faculty; University of Zurich; Winterthurerstrasse 260 8057 Zurich Switzerland
2. Dermatology Department; University Clinic of Lausanne; Avenue de Beaumont 29 1011 Lausanne Switzerland
3. Equine Department; Vetsuisse Faculty; University of Bern; Länggassstrasse 124 3012 Bern Switzerland