1. Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, 2-11, Inada, Obihiro, Hokkaido 080-8555, Japan
2. Cooperative Department of Veterinary Medicine, Iwate University, 3-18-8, Morioka, Iwate 020-8550, Japan
3. United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
4. Veterinary Medical Center, Obihiro University of Agriculture and Veterinary Medicine, 2-11, Inada, Obihiro, Hokkaido 080-8555, Japan
5. Department of Veterinary Theriogenology, Agriculture and Forestry University, Rampur, Chitwan, 44200, Nepal
6. Ichihara Elephant Kingdom Zoological Park, 937, Yamakogawa, Ichihara, Chiba, 290-0521, Japan
7. Department of Veterinary Medicine, Azabu University, 1-17-71, Fuchinobe, Sagamihara, Kanagawa 252-5201, Japan
8. Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, 2-11, Inada, Obihiro, Hokkaido 080-8555, Japan