ESEN : a comparison of vaccination programmes Part one: diphtheria Lévy-Bruhl, D and Pebody, R G and Veldhuijzen, I and Valenciano, M and Osborne, K and members who provided data, on behalf of the ESEN project, Eurosurveillance, 3, 87 (1998), https://doi.org/10.2807/esm.03.10.00087-en