Castagnetti C, Rossi M, Parmeggiani F, Zanoni R G, Pirrone A, Mariella J
Veterinary Clinical Department, Faculty of Veterinary Medicine, University of Bologna, 40064 Ozzano Emilia, Italy.
Vet Rec. 2008 Mar 15;162(11):347-9. doi: 10.1136/vr.162.11.347.