1. Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido 069-8501, Japan.
2. Department of Veterinary Radiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan.
3. Department of Ophthalmology and Visual Science, Graduate School of Medicine, Yokohama City University, Kanagawa 236-0004, Japan.
4. Dainichiseika-Donated Chair of Research Division for Innovative Biomaterials, Center for Biological Resources and Informatics, Tokyo Institute of Technology, Kanagawa 226-8503, Japan.