1. Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
2. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, MN, USA
3. WIL Research (a Charles River Company), Hillsborough, NC, USA
4. Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA