Antiretroviral drug resistance in a respondent-driven sample of HIV-infected men who have sex with men in Brazil.

Bermúdez-Aza EH, Kerr LR, Kendall C, Pinho AA, de Mello MB, Mota RS, Guimarães MD, Alencar CS, de Brito AM, Dourado IC, da Batista SM, Abreu F, de Oliveira LC, de Souza Moraes A, Benzaken AS, Merchan-Hamann E, de Freitas GM, McFarland W, Albuquerque E, Rutherford GW, Sabino E