Institution: | 1. Department of Veterinary Clinical Sciences, Hawkshead Lane, Hatfield, Hertfordshire AL9 7TA, UK;2. Clevedale Veterinary Practice, Upleatham, Redcar, TS11 8AG, UK;3. C. Lonnell: Department of Clinical Science, Swedish University of Agricultural Sciences, Uppsala, Sweden;4. Department of Veterinary Basic Sciences, The Royal Veterinary College, Royal College Street, London NW1 0TU, UK |