1. Laboratory of Comprehensive Veterinary Clinical Studies, Department of Veterinary Medicine, Faculty of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252–0880, Japan
2. Laboratory of Medical Zoology, Department of Veterinary Medicine, Faculty of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252–0880, Japan
3. NORTH LAB Inc., 2–8–35 Kita-hondouri, Shiraishi-ku, Sapporo, Hokkaido 003–0027, Japan