1. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Seoul National University, Seoul 08826, Republic of Korea
2. Department of Clinical Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan
3. Center of Animal Disease Modelling and Surveillance, The Department of Medicine and Epidemiology, School of Veterinary Medicine University of California, Davis, CA 95616, USA
4. College of Veterinary Medicine and Veterinary Medical Research Institute, Jeju National University, Jeju 63243, Republic of Korea