1. Influenza (seasonal);World Health Organization,2009
2. Efficacy and effectiveness of influenza vaccines: a systematic review and meta-analysis;Osterholm;Lancet Infect Dis,2012
3. Key facts about seasonal flu vaccine;Centers for Disease Control and Prevention,2011
4. Canadian immunization guide seventh edition – 2006;Public Health Agency of Canada,2011
5. Statement on seasonal trivalent inactivated influenza vaccine (TIV) for 2010–2011. Canada Communicable Disease Report;National Advisory Committee on Immunization,2010