Slappendel R J, Versteeg S A, van Zon P H, Rothuizen J, van Oost B A
Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands.
Vet Q. 1998;20 Suppl 1:S90-1. doi: 10.1080/01652176.1998.10807436.