RT Journal Article SR Electronic(1) A1 Bergsaker, M A R A1 Feiring, B YR 2006 T1 Introduction of pneumococcal conjugate vaccine into the Norwegian childhood vaccination programme JF Weekly releases (1997–2007) VO 11 IS 5 SP 2893 OP DO https://doi.org/10.2807/esw.11.05.02893-en UL https://www.eurosurveillance.org/content/10.2807/esw.11.05.02893-en