1. Department of Clinical Sciences, North Carolina State University College of Veterinary Medicine, 1060 William Moore Drive, Raleigh, NC 27606, USA
2. Hanes Veterinary Medical Center, North Carolina Zoological Park, 4401 Zoo Parkway, Asheboro, North Carolina 27205, USA
3. Environmental Medicine Consortium, North Carolina State University College of Veterinary Medicine, 1060 William Moore Drive, Raleigh, North Carolina 27607, USA