Joseph Donovan, Nguyen D Bang, Darma Imran, Ho D T Nghia, Erlina Burhan, Dau T T Huong, Nguyen T T Hiep, Lam H B Ngoc, Dang V Thanh, Nguyen T Thanh, Anna L S Wardhani, Kartika Maharani, Cakra P Gasmara, Nguyen H H Hanh, Pham K N Oanh, Riwanti Estiasari, Do D A Thu, Ardiana Kusumaningrum, Le T Dung, Do C Giang, Dang T M Ha, Nguyen H Lan, Nguyen V V Chau, Nguyen T M Nguyet, Ronald B Geskus, Nguyen T T Thuong, Evelyne Kestelyn, Raph L Hamers, Nguyen H Phu, Guy E Thwaites; ACT HIV Investigators