1. Wood Veterinary Group; 125 Bristol Road Gloucester GL2 4NB
2. Institute for Veterinary Pathology; University of Zurich; Winterthurerstrasse 268 CH-8057 Zurich Switzerland
3. Department of Biological Sciences; University of Warwick; Coventry CV4 7AL
4. Roche UK; Heanor Gate Heanor Derbyshire DE75 7SG