Samuel Tucker,^* Kate Archibald,^* Eli B. Cohen,^* Samantha Sommer,^* Bruce W. Keene,^* Larry J. Minter,^* Katie W. Delk<sup>*


*</sup>The Departments of Clinical Sciences (Tucker, Cohen, Keene) and Population Health and Pathobiology (Sommer), College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, Raleigh, NC 27607, USA; and Hanes Veterinary Medical Center (Archibald, Minter, Delk), North Carolina Zoo, 4401 Zoo Parkway, Asheboro, NC 27205, USA. Present addresses (Archibald): Omaha's Henry Doorly Zoo and Aquarium, 3701 S 10th Street, Omaha, NE 68107, USA; (Delk) Brookfield Zoo, 8400 W 31st Street, Brookfield, IL 60513, USA.