1. Research Institute of Veterinary Medicine, Chungbuk National University, Cheongju 361-763, Republic of Korea
2. Lee’s Biotech Co., Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-606, Republic of Korea
3. College of Pharmacy, Chungbuk National University, Cheongju 361-763, Republic of Korea
4. College of Veterinary Medicine, Chungbuk National University, Cheongju 361-763, Republic of Korea