[1] Karolinska Inst, Dept Virol, Swedish Inst Infect Dis & Control, S-17182 Solna, Sweden
[2] NCI, HIV Drug Resistance Program, NIH, Frederick, MD 21701 USA
[3] Univ Witwatersrand, Perinatal HIV Res Unit, Johannesburg, South Africa
[4] Natl Inst Communicable Dis, Johannesburg, South Africa
[5] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[6] Boehringer Ingelheim GmbH & Co KG, Ingelheim, Germany
[7] Boehringer Ingelheim Pharmaceut, Ridgefield, CT USA
[8] Idenix Pharmaceut, Cambridge, MA USA
[9] Univ Pittsburgh, Pittsburgh, PA USA
[10] Tufts Univ, Dept Mol Biol & Microbiol, Boston, MA 02111 USA