1. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea.
2. Farm Animal Clinical Training and Research Center, Institutes of Green Bio Science & Technology, Seoul National University, Pyeongchang 25354, Korea.
3. Pathologic Diagnostic Laboratory, Animal Disease Diagnostic Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea.
4. Department of Biostatistics and Epidemiology, Graduate School of Public Health, Seoul National University, Seoul 08826, Korea.