RT Journal Article SR Electronic(1) A1 Hasseltvedt, V A1 Høiby, E A YR 2002 T1 Systemic pneumococcal disease in Norway, 2001 JF Weekly releases (1997–2007) VO 6 IS 8 SP 2031 OP DO https://doi.org/10.2807/esw.06.08.02031-en UL https://www.eurosurveillance.org/content/10.2807/esw.06.08.02031-en