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3. World Health Organization. COVID-19 advice for the public: getting vaccinated. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/covid-19-vaccines/advice.
4. Worldwide Estimation of Parental Acceptance of COVID-19 Vaccine for Their Children: A Systematic Review and Meta-Analysis
5. The Government of the Hong Kong Special Administrative Region. Archive of statistics on 5th wave of COVID-19. https://www.coronavirus.gov.hk/eng/5th-wave-statistics.html.