1. S. Y. Heo:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju, Korea
2. H. B. Lee:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju, Korea
3. M. S. Kim:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju, Korea
4. N. S. Kim:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju, Korea