1. Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27606, USA
2. Hanes Veterinary Medical Center, North Carolina Zoological Park, 4401 Zoo Parkway, Asheboro, NC 27205, USA
3. Environmental Medicine Consortium, North Carolina State University, College of Veterinary Medicine, 1060 William Moore Drive, Raleigh, NC 27607, USA
4. The Maryland Zoo in Baltimore, 1876 Mansion House Drive, Baltimore, MD 21217, USA