1. Osaka Prefecture University Veterinary Medical Center, Osaka Prefecture University, 1-58 North Rinku-Orai, Izumisano, Osaka 598-8531, Japan
2. Department of Advanced Clinical Medicine, Division of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 North Rinku-Orai, Izumisano, Osaka 598-8531, Japan
3. Senju Pharmaceutical Co., Ltd., 6-4-3 Minatojima-Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan