1. Laboratory of Farm Animal Pathophysiology, Department of Farm Animal Medicine, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-0836, Japan
2. Laboratory of Anatomy, Department of Basic Veterinary Science, Faculty of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
3. Laboratory of Agrobiomedical Science, Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
4. Nayoro Veterinary Clinical Center, Hokkaido Agricultural Mutual Aid Association, Nayoro 096-0072, Japan
5. Section of Large Animal Clinical Sciences, Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan