1. Influenza vaccination in community-dwelling elderly: impact on mortality and influenza-associated morbidity;Voordouw;Arch Intern Med,2003
2. Preventive effects of influenza and pneumococcal vaccination in the elderly–results from a population-based retrospective cohort study;Rose;Hum Vaccin Immunother,2021
3. Our World in data. Deaths from pneumonia, by age, World, 1990 to 2019. Available from: https://ourworldindata.org/pneumonia.
4. World Health Organisation. WHO recommendations for routine immunization - summary tables. Available from: https://www.who.int/teams/immunization-vaccines-and-biologicals/policies/who-recommendations-for-routine-immunization---summary-tables.
5. Centers for Disease Control and Prevention. Recommended vaccines for adults. Available from: https://www.cdc.gov/vaccines/adults/rec-vac/index.html.