RT Journal Article SR Electronic(1) A1 Van Loock, F A1 Gill, N A1 Wallyn, S A1 Nicoll, A A1 Desenclos, J C A1 Leinikki, P YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.07.05.00371-es