1. Department of Population Health & Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA.
2. Department of Pathology and Infectious Diseases, School of Veterinary Medicine, University of Surrey, Guildford, Surrey, United Kingdom.
3. Department of Horticulture & Landscape Architecture, College of Agricultural Sciences, Colorado State University, Fort Collins, Colorado, USA.