1. Swiss Institute of Equine Medicine (ISME), Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland
2. Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland
3. Research Group Oncology, University Equine Clinic, University of Veterinary Medicine, 1210 Vienna, Austria
4. Department of Large Animal Surgery, Anesthesiology and Orthopaedics, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium
5. Zoo Basel, Binningerstrasse 40, 4054 Basel, Switzerland