RT Journal Article SR Electronic(1) A1 Hergens, Maria-Pia A1 Baum, Ulrike A1 Brytting, Mia A1 Ikonen, Niina A1 Haveri, Anu A1 Wiman, Åsa A1 Nohynek, Hanna A1 Örtqvist, Åke YR 2017 T1 Mid-season real-time estimates of seasonal influenza vaccine effectiveness in persons 65 years and older in register-based surveillance, Stockholm County, Sweden, and Finland, January 2017 JF Eurosurveillance VO 22 IS 8 SP 30469 OP DO https://doi.org/10.2807/1560-7917.ES.2017.22.8.30469 UL https://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2017.22.8.30469