Rahal Sheila C, Mamprim Maria J, Caporali Evelyn H G, Teixeira Carlos R
Department of Veterinary Surgery and Anesthesiology, Faculty of Veterinary Medicine and Animal Science, UNESP Botucatu, Caixa Postal 560, Rubião Júnior, s/n, CEP: 18618-000, Botucatu, SP, Brazil.
Can Vet J. 2003 Jul;44(7):597, 599.