1. S. H. Kim:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, Korea
2. N. S. Kim:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, Korea
3. K. C. Lee:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, Korea
4. H. B. Lee:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, Korea
5. M. S. Kim:
Department of Veterinary Surgery, College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, Korea