1. Laboratory of Infectious Diseases, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University
2. Departments of Veterinary Pathology, College of Veterinary Medicine, Chonnam National University
3. Departments of Veterinary Theriogenology, College of Veterinary Medicine, Chonnam National University
4. Departments of Veterinary Teaching Hospital, College of Veterinary Medicine, Chonnam National University