Effect of Plasmodium falciparum sulfadoxine-pyrimethamine resistance on the effectiveness of intermittent preventive therapy for malaria in pregnancy in Africa: a systematic review and meta-analysis. - van, Eijk AM; Larsen, DA; Kayentao, K; Koshy, G; Slaughter, DEC; Roper, C; Okell, LC; Desai, M; Gutman, J; Khairallah, C; Rogerson, SJ; Hopkins, Sibley C; et al. (Lancet Infectious Diseases, 2019)