RT Journal Article SR Electronic(1) A1 Twisselmann, B YR 2001 T1 Surveillance for infectious diseases in the European Union JF Weekly releases (1997–2007) VO 5 IS 42 SP 2039 OP DO https://doi.org/10.2807/esw.05.42.02039-en UL https://www.eurosurveillance.org/content/10.2807/esw.05.42.02039-en