Implications of spatially heterogeneous vaccination coverage for the risk of congenital rubella syndrome in South Africa

C. J. E. Metcalf, C. Cohen, J. Lessler, J. M. McAnerney, G. M. Ntshoe, A. Puren, P. Klepac, A. Tatem, B. T. Grenfell and O. N. Bjørnstad