TY - JOUR A1 - Petra Study Team T1 - Efficacy of three short-course regimens of zidovudine and lamivudine in preventing early and late transmission of HIV-1 from mother to child in Tanzania, South Africa, and Uganda (Petra Study): A randomised, double-blind, placebo-controlled trial Y1 - 2002 JF - Lancet VL - 359 SP - 1178 EP - -1186 ER -