Johnson Amy L, Jesty Sophy A, Gelzer Anna R M, Divers Thomas J, Kraus Marc S
Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
J Am Vet Med Assoc. 2007 Sep 1;231(5):706-8. doi: 10.2460/javma.231.5.706.