1. Instituto Conmemorativo Gorgas de Estudios de la Salud, Ciudad de Panamá, Panama
2. Department of Environmental and Occupational Health, School of Public Health, Indiana University, Bloomington, IN, USA
3. Department of Veterinary Pathology, University of Georgia, Athens, GA, USA
4. Center for the Ecology of Infectious Diseases, University of Georgia, Athens, GA, USA
5. Department of Anthropology, University of Georgia, Athens, GA, USA
6. Department of Geography, University of British Columbia, Vancouver, Canada