RT Journal Article SR Electronic(1) A1 Martin, S A1 Andersson, Y A1 Hedlund, K O A1 Giesecke, J YR 2004 T1 New norovirus surveillance system in Sweden JF Weekly releases (1997–2007) VO 8 IS 39 SP 2556 OP DO https://doi.org/10.2807/esw.08.39.02556-en UL https://www.eurosurveillance.org/content/10.2807/esw.08.39.02556-en