Affiliation: | 1. Department of Veterinary Medicine, The Queens Veterinary School Hospital, University of Cambridge, , Cambridge, CB3 0ES;2. Willows Veterinary Centre and Referral Service, , Shirley, Solihull, B90 4NH;3. Woodcroft Referrals, Cheadle Hulme Veterinary Hospital, , Cheadle Hulme, Stockport, Cheshire, SK8 5?LU |