RT Journal Article SR Electronic(1) A1 Romanowska, M A1 Nowak, I A1 Rybicka, K A1 Brydak, L B YR 2008 T1 The introduction of the SENTINEL influenza surveillance system in Poland - experiences and lessons learned from the first three epidemic seasons JF Eurosurveillance VO 13 IS 8 SP 7SP 8046 OP 8 DO https://doi.org/10.2807/ese.13.08.08046-en UL https://www.eurosurveillance.org/content/10.2807/ese.13.08.08046-en