RT Journal Article SR Electronic(1) A1 Ramsay, M E A1 Brown, D W A1 Appleton, H A1 Megson, B A1 Polynikis, A A1 Papantoniou, L A1 Eleftheriou, A YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.01.04.00159-fr