Castro Patrícia F, Unruh Silvana M, Ferrigno Cássio R A, Fantoni Denise T
Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of São Paulo, Cidade Universitária, SP, Brazil.
J Am Vet Med Assoc. 2009 Jul 15;235(2):151-2. doi: 10.2460/javma.235.2.151.