1. Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
2. Mountain Gorilla Veterinary Project–Gorilla Doctors, Karen C. Drayer Wildlife Health Center, School of Veterinary Medicine, University of California, Davis, CA, USA
3. Zoo and Exotic Animal Pathology Service, Infectious Diseases Laboratory, Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
4. Zoological Pathology Program, University of Illinois College of Veterinary Medicine, Maywood, IL, USA