1. Ghebrehewet S, MacPherson P, Ho A (2016) Influenza. BMJ 355:i6258. doi:
10.1136/bmj.i6258
2. WHO (2017) Global influenza surveillance and response system (GISRS): World Health Organization.
http://www.who.int/influenza/gisrs_laboratory/en/
. Accessed 22 Jan 2017
3. Beyer Walter EP, McElhaney J, Smith DJ et al (2013) Cochrane re-arranged: support for policies to vaccinate elderly people against influenza. Vaccine 31:6030–6033. doi:
10.1016/j.vaccine.2013.09.063
4. WHO (2003) Prevention and control of influenza pandemics and annual epidemics: resolution of the World Health assembly. Resolution WHA56.19, tenth plenary meeting, 28 May 2003: World Health Organization.
http://apps.who.int/gb/archive/pdf_files/WHA56/ea56r19.pdf
. Accessed 8 Jan 2017
5. European Council (2009) Council recommendation on seasonal influenza vaccination.
http://ec.europa.eu/health/ph_threats/com/Influenza/docs/seasonflu_rec2009_en.pdf
. Accessed 8 Jan 2017