1. National Control Program for HIV/AIDS/STI República del Paraguay Ministry of Public Health and Social Welfare Asunción Paraguay
2. Department of Medicine, Center for Public Health Research University of California San Francisco California USA
3. Centre for Research in Infectious Diseases National Institute of Respiratory Diseases Mexico City Mexico
4. Department of Global HIV, Hepatitis and STI Programmes World Health Organization Geneva Switzerland
5. Centro para el Desarrollo de la Investigación Científica Asunción Paraguay
6. Direccion de Investigacion, Facultad de Ciencias Medicas Universidad Nacional de Caaguazú Coronel Oviedo Paraguay
7. Center for Public Health Research San Francisco Department of Public Health San Francisco California USA