Hill T L, Breitschwerdt E B, Cecere T, Vaden S
Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606, USA.
J Vet Intern Med. 2008 Jan-Feb;22(1):219-22. doi: 10.1111/j.1939-1676.2007.0040.x.