Clegg P D, Radford A D, Carter S D
Department of Veterinary Clinical Science and Animal Husbandry, University Veterinary Teaching Hospital, University of Liverpool, Neston, S. Wirral, L64 7TE, UK.
Vet J. 1999 May;157(3):336-8. doi: 10.1053/tvjl.1998.0328.