Chlorproguanil-dapsone versus sulfadoxine-pyrimethamine for sequential episodes of uncomplicated falciparum malaria in Kenya and Malawi: a randomised clinical trial. by Sulo, J, Chimpeni, P, Hatcher, J, Kublin, J, Plowe, C, Molyneux, M, Marsh, K, Taylor, T, Watkins, WM, Winstanley, P