1. Alberta Health. Alberta immunization policy. 1995-2014. Available at http://www.health.alberta.ca/professionals/immunization-poli .
2. Andrews, N. J., Waight, P. A., George, R. C., et al. (2012). Impact and effectiveness of 23-valent pneumococcal polysaccharide vaccine against invasive pneumococcal disease in the elderly in England and Wales. Vaccine, 30, 6802–6808.
3. Blommaert, A., Bilcke, J., Willem, L., et al. (2016). The cost-effectiveness of pneumococcal vaccination in healthy adults over 50: an exploration of influential factors for Belgium. Vaccine, 34(18), 2016–2012.
4. Bonten M, Bolkenbaas M, Huijts S, et al. (2014). Community-acquired pneumonia immunization trial in adults─CAPiTA. 9th International Symposium on Pneumococci and Pneumococcal Diseases Poster, Hyderabad, India, March 9-13, 2014. Available at: http://isppd.meetingxpert.net/swf/poster_viewer.aspx .
5. Canadian Agency for Drugs and Technologies in Health. Guidelines for the economic evaluation of health technologies [3rd Edition], 2006. Ottawa, Can Underwrit.