1. National Animal Disease Center, USDA-ARS, Ames, Iowa, USA
2. Royal Veterinary College, London, United Kingdom
3. Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
4. Department of Emergency Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
5. Department of Emergency Medicine of Chang Gung Memorial Hospital at Keelung, Keelung City, Taiwan