1. Department of Medicine, Section of Infectious Diseases, University of the Philippines-Philippine General Hospital, Manila, Philippines
2. Institute of Molecular Biology and Biotechnology, National Institutes of Health, University of the Philippines (UP-NIH), Manila, Philippines
3. Epidemiology Bureau, Department of Health, Republic of the Philippines, Manila, Philippines
4. San Lazaro Hospital, Department of Health, Manila, Philippines
5. STD and AIDS Cooperative Center Laboratory (SACCL), San Lazaro Hospital, Department of Health, Manila, Philippines
6. Sustained Health Initiatives of the Philippines, Mandaluyong, Philippines