1. U.S. Naval Medical Research Unit No. 6 Lima Peru
2. Johns Hopkins School of Public Health Baltimore MD USA
3. U.S. Centers for Disease Control and Prevention Division of Global Health Protection Nairobi Kenya
4. Fogarty International Center National Institutes of Health Bethesda MD USA
5. U.S. Centers for Disease Control and Prevention Atlanta GA USA
6. Tulane School of Public Health and Tropical Medicine New Orleans LA USA
7. San Marcos University Veterinary School Lima Peru