Cober R E, Schober K E, Hildebrandt N, Sikorska E, Riesen S C
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
J Vet Intern Med. 2009 May-Jun;23(3):657-61. doi: 10.1111/j.1939-1676.2009.0314.x. Epub 2009 Apr 28.