1. Department of Veterinary Sciences and Services; Royal Veterinary College; University of London; North Mymms Hatfield Hertfordshire UK
2. Small Animal Clinic (Internal Medicine); Justus-Liebig University; Giessen Germany
3. Institute for Veterinary Pathology; Justus-Liebig University Giessen; Giessen Germany
4. Department of Pathology and Pathogen Biology; Royal Veterinary College; University of London; North Mymms Hatfield Hertfordshire UK