1. National Advisory Committee on Immunization (NACI). Statement on seasonal influenza vaccine for 2014-2015. http://www.phac-aspc.gc.ca/naci-ccni/flu-grippe-eng.php (2014). Accessed 05 Aug 2015.
2. Public Health Agency of Canada. Vaccine coverage amongst adult Canadians: Results from the 2012 adult National Immunization Coverage (aNIC) survey. http://www.phac-aspc.gc.ca/im/nics-enva/vcac-cvac-eng.php . (2014). Accessed 06 Jun 2015.
3. World Health Organization. Influenza (seasonal) fact sheet #211. http://www.who.int/mediacentre/factsheets/fs211/en/ (2014). Accessed 21 Feb 2016.
4. Bowles S, Strang R. Infectious diseases: influenza. In: Jovaisas B, editor. Compendium of therapeutic choices. Ottawa: Academic; 2014. p. 1403–13.
5. NHS England Department of Health. The national flu immunisation programme 2015/16. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/418428/Annual_flu_letter_24_03_15__FINALv3_para9.pdf (2015). Accessed 16 May 2016.