RT Journal Article SR Electronic(1) A1 D'Ancona, F A1 Alfonsi, V A1 Caporali, M R A1 Ranghiasci, A A1 Ciofi Degli Atti, M L YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.12.02.00685-fr