RT Journal Article SR Electronic(1) A1 Meijer, A A1 Meerhoff, T J A1 Meuwissen, L. E. A1 Van Der Velden, J A1 Paget, W J A1 European Influenza Surveillance Scheme (EISS) YR T1 JF VO OP UL https://www.eurosurveillance.org/content/10.2807/esm.12.09.00733-fr