Strategies for nevirapine initiation in HIV-infected children taking pediatric fixed-dose combination "baby pills" in Zambia: a randomized controlled trial. by Mulenga, V, Cook, A, Walker, A, Kabamba, D, Chijoka, C, Ferrier, A, Kalengo, C, Kityo, C, Kankasa, C, Burger, D, Thomason, M, Chintu, C, Gibb, D