RT Journal Article SR Electronic(1) A1 Alvarez do Barrio, M A1 González Díez, R A1 Hernández Sánchez, J M A1 Oyonarte Gómez, S YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.10.02.00521-fr