1. Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, 3900 Delancey Street, Philadelphia, PA 19104, USA
2. Department of Veterinary Pathology, University of Liverpool, Liverpool L69 3BX
3. Department of Pathology and Infectious Diseases, Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire AL9 7TA
4. Department of Veterinary Clinical Sciences, Royal Veterinary College, University of London, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire AL9 7TA
5. Klinik für Klientiere, Justus‐Liebig Universität Giessen, Franfurterstrasse 126, D‐35392 Giessen, Germany