1. Department of Veterinary Surgery, College of Veterinary Medicine, Kyungpook National University, Daegu 702–701, Republic of Korea
2. Daegu Animal Medical Center, Daegu 706–842, Republic of Korea
3. Department of Veterinary Medical Imaging, College of Veterinary Medicine, Kyungpook National University, Daegu 702–701, Republic of Korea
4. Department of Veterinary Pathology, School of Veterinary Medicine, Kitasato University, 23–35–1 Higashi, Towada, Aomori 034–8628, Japan