1. School of Veterinary Sciences; University of Bristol, Langford Small Animal Hospital; Langford, Bristol BS405DU UK
2. The Royal Veterinary College; Hatfield; AL9 7TA UK
3. Cave Veterinary Specialists, George's Farm Nr Wellington; Wellington, TA21 9LE UK
4. Fizpatrick Referral Hospital; Godalming, GU07 2QQ UK