Negative Correlation between Circulating CD4+FOXP3+CD127− Regulatory T Cells and Subsequent Antibody Responses to Infant Measles Vaccine but Not Diphtheria–Tetanus–Pertussis Vaccine Implies a Regulatory Role - Ndure, J; Noho-Konteh, F; Adetifa, J; Cox, M; Barker, F; Le, M; Sanyang, L; Drammeh, A; Whittle, H; Clarke, E; Plebanski, M; Rowland-Jones, S; et al. (Frontiers in Immunology, 2017)