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  1. Penttinen PM, Friede MH. Decreased effectiveness of the influenza A(H1N1)pdm09 strain in live attenuated influenza vaccines: an observational bias or a technical challenge? Euro Surveill. 2016;21(38):30350.  https://doi.org/10.2807/1560-7917.ES.2016.21.38.30350  PMID: 27684999 
  2. Centers for Disease Control and Prevention (CDC). Advisory Committee on Immunization Practices (ACIP). ACIP meeting information, Presentation slides 22-23 June 2016. [Accessed 27 Sep 2016]. Available from: http://www.cdc.gov/vaccines/acip/meetings/slides-2016-06.html
  3. Terveyden ja hyvinvoinnin laitos (THL) [National Institute for Health and Welfare, Finland]. Influenssakausi Suomessa, viikot 40/2015-20/2016. Seurantaraportti. [Influenza season in Finland, weeks 40/2015-20/2016. Surveillance report]. 2016. Available from: http://www.julkari.fi/bitstream/handle/10024/130791/URN_ISBN_978-952-302-682-7.pdf?sequence=1
  4. Fry AM, Flannery B, Olsen SJ, Grohskopf L, Bresee J. Letter to the editor: Regarding the editorial by Penttinen and Friede. Euro Surveill. 2016;21(40):pii=30366. DOI: http://dx.doi.org/ https://doi.org/10.2807/1560-7917.ES.2016.21.40.30366 
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