[1] Department of Veterinary Pathology,
[2] University of Glasgow Veterinary School,undefined
[3] Bearsden Road,undefined
[4] Glasgow,undefined
[5] Scotland G61 1QH e-mail: gvpa07@udcf.gla.ac.uk,undefined
[6] Tel.: +44-141-339-8855 (Ext. 2869),undefined
[7] Fax: +44-141-330-5602,undefined
[8] Department of Veterinary Clinical Studies,undefined
[9] University of Glasgow Veterinary School,undefined
[10] Bearsden Road,undefined
[11] Glasgow,undefined
[12] Scottland G61 1QH,undefined