Packer Rebecca A, Cohn Leah A, Wohlstadter David R, Shelton G Diane, Naylor Jonathan M, Zello Gordon A, Ewaschuk Julia B, Williams David A, Ruaux Craig G, O'Brien Dennis P
Department of Veterinary Medicine and Surgery, Veterinary Medical Teaching Hospital, Columbia, MO 65211, USA.
J Vet Intern Med. 2005 Jan-Feb;19(1):106-10. doi: 10.1892/0891-6640(2005)19<106:dastep>2.0.co;2.