Robustness of measles immunity in parturient women in Gipuzkoa, Basque Country, Spain, in the post-vaccination era Cilla, G and Serrano-Bengoechea, E and Vicente, D and Montes, M and PĂ©rez-Trallero, E, Eurosurveillance, 12, 732 (2007), https://doi.org/10.2807/esm.12.09.00732-en