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Published online by Cambridge University Press: 31 May 2001
Epidemiol. Infect.125 (2000), 115–25
W. J. EDMUNDS, R. G. PEBODY, H. AGGERBACK, G. BERBERS, M. A. E. CONYN-VAN SPAENDONCK, H. O. HALLANDER, R. OLANDER, P. A. C. MAPLE, H. E. DE MELKER, P. OLIN, F. FIEVRET-GROYNE, C. ROTA, S. SALMASO, A. TISCHER, C. VON-HUNOLSTEIN AND E. MILLER On behalf of the ESEN Project