RT Journal Article SR Electronic(1) A1 Pons, C A1 Pelayo, T A1 Pachon, I A1 Galmes, A A1 González, L A1 Sánchez, C A1 Martinez, F YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.05.07.00014-pt