Affiliation: | 1)Department of Veterinary Clinical Sciences, College of Veterinary Medicine and BK21 Program for Veterinary Science, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151–742, Republic of Korea;2)Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri-Columbia, Columbia, MO 65211, U.S.A |