1. World Health Organization, Country Office Hanoi Vietnam
2. Viet Nam Authority for HIV/AIDS Control Hanoi Vietnam
3. Can Tho Provincial AIDS Centre, Vietnam Can Tho City Vietnam
4. Thai Nguyen Provincial AIDS Centre Thai Nguyen City Vietnam
5. National Institute for Hygiene and Epidemiology Hanoi Vietnam
6. HIV Department World Health Organization Geneva Switzerland
7. Clinical Research Department London School of Hygiene and Tropical Medicine London UK