1. Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8591, Japan
2. Anicom Specialty Medical Institute, Inc., Nishi-Shinjuku, Tokyo 160-0023, Japan
3. Department of Veterinary Surgery and Radiology, Faculty of Veterinary Medicine, University of Maiduguri, Maiduguri, Borno State, Nigeria
4. Department of Veterinary Nursing Science, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8591, Japan