1. Institute of Animal Medicine, Gyeongsang National University, Jinju 660-701, Republic of Korea
2. College of Veterinary Medicine, Gyeongsang National University, Jinju 660-701, Republic of Korea
3. Department of Anatomy, College of Veterinary Medicine, Gyeongsang National University, Jinju 660-701, Republic of Korea
4. Headquarters for Marine Environment, National Fisheries Research & Development Institute, Shiran-ri, Gijang-eup, Gijang-gun, Busan 619-705, Republic of Korea