1. Department of Anatomy, College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea.
2. Department of Veterinary Internal Medicine and Geriatrics, College of Veterinary Medicine, Kangwon National University, Chuncheon, Korea.
3. Department of Anatomy and Cell Biology, College of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University, Seoul, Korea.
4. Department of Neurobiology, Kangwon National University School of Medicine, Chuncheon, Korea.