1. Department of Comparative, Diagnostic, and Population Medicine, College of Veterinary Medicine, University of Florida, Gainesville, Florida 32610.
2. Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Gainesville, Florida 32610.
3. Galapagos Science Center, Universidad San Francisco de Quito, Galápagos, Ecuador.
4. College of Veterinary Medicine, College of Public Health and Health Professions, and the Center for Latin American Studies, University of Florida, Gainesville, Florida 32610.