1. Section of Ophthalmology Equine Department Vetsuisse Faculty University of Zurich Zürich Switzerland
2. Animal Eye Center PC, 215 W 67th Ct. Loveland CO 80538 USA
3. Section of Epidemiology Vetsuisse Faculty University of Zürich Zürich Switzerland
4. Weston Lakes Animal Hospital Weston Florida
5. Equine Clinic Faculty of Veterinary Medicine University of Veterinary and Pharmaceutical Sciences Brno Czech Republic
6. Praxis für Tieraugenheilkunde Tierärztliches Überweisungszentrum Hauptstrasse 21 CH‐4456 Tenniken Switzerland