1. Veterinary Medical Center, College of Life, Environmental and Advanced Sciences, Osaka Prefecture University, 1-58 Rinku-Ourai kita, Izumisano, Osaka 598-8531, Japan
2. Laboratory of Veterinary Pathology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-Ourai kita, Izumisano, Osaka 598-8531, Japan
3. Laboratory of Veterinary Radiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-Ourai kita, Izumisano, Osaka 598-8531, Japan