1. Department of Veterinary Internal Medicine, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea.
2. BK21 Program of Integrative Network Systems for Veterinarians in Basic Science, Industrial Animals and Preventive Medicine, Konkuk University, Seoul 143-701, Korea.
3. KRF Priority Zoonotic Disease Research Institute, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Korea.