RT Journal Article SR Electronic(1) A1 Bille, J A1 Blanc, D S A1 Schmid, H A1 Boubaker, K A1 Baumgartner, A A1 Siegrist, H H A1 Tritten, M L A1 Lienhard, R A1 Berner, D A1 Anderau, R A1 Treboux, M A1 Ducommun, J M A1 Malinverni, R A1 Genné, D A1 Erard, P A1 Waespi, U YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.11.06.00633-es