RT Journal Article SR Electronic(1) A1 Ciofi Degli Atti, M L A1 Filia, A A1 Revello, M G A1 Buffolano, W A1 Salmaso, S YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.09.04.00462-pt