Impact of lay health worker programmes on the health outcomes of mother-child pairs of HIV exposed children in Africa: A scoping review. - Schmitz, Kathrin; Basera, Tariro Jayson; Egbujie, Bonaventure; Mistri, Preethi; Naidoo, Nireshni; Mapanga, Witness; Goudge, Jane; Mbule, Majorie; Burtt, Fiona; Scheepers, Esca; Igumbor, Jude (PLoS ONE, 2019)