1. Department of Veterinary Laboratory Medicine, College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Korea.
2. Department of Veterinary Obstetrics, College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Korea.
3. Department of Veterinary Pathology, College of Veterinary Medicine, Chonnam National University, Gwangju 61187, Korea.