RT Journal Article SR Electronic(1) A1 Dawson, S J A1 Evans, M R A1 Willby, D A1 Bardwell, J A1 Chamberlain, N A1 Lewis, D A YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.11.06.00632-pt