1. Department of Animal Medical Sciences, Faculty of Life Sciences, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-Ku, Kyoto 603–8555, Japan
2. Laboratory of Veterinary Pharmacology, Department of Veterinary Medicine, Faculty of Applied Biological Science, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
3. Department of Pathogenetic Veterinary Science, United Graduate School of Veterinary Science, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan