RT Journal Article SR Electronic(1) A1 Kuijper, E J A1 Coignard, B A1 Brazier, J S A1 Suetens, C A1 Drudy, D A1 Wiuff, C A1 Pituch, H A1 Reichert, P A1 Schneider, F A1 Widmer, A F A1 Olsen, K EP A1 Allerberger, F A1 Notermans, D W A1 Barbut, F A1 Delmée, M A1 Wilcox, M A1 Pearson, A A1 Patel, B A1 Brown, D J A1 Frei, R A1 Akerlund, T A1 Poxton, I R A1 Tüll, Peet YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.12.06.00714-es