1. Pathobiology and Population Sciences; The Royal Veterinary College; Hatfield Herts AL9 7TA UK
2. Vets Now Ltd.; Castle Riggs Dunfermline KY11 8SG UK
3. Clinical Sciences and Services; The Royal Veterinary College; Hatfield Herts AL9 7TA UK
4. Faculty of Veterinary Science; The University of Sydney; Sydney New South Wales 2006 Australia