1. Department of Population Health and Pathobiology, Veterinary School, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27607, USA
2. Department of Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, Selangor, Malaysia
3. College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA