1. Atun, R. (2004). What are the advantages and disadvantages of restructuring a health care system to be more focused on primary care services? Copenhagen, WHO Regional Office for Europe, Health Evidence Network report. http://www.euro.who.int/document/e82997.pdf
2. Census and Statistics Department. (2017). Hong Kong population projections 2017–2066. Hong Kong: Hong Kong Special Administrative Region Government. https://www.statistics.gov.hk/pub/B1120015072017XXXXB0100.pdf
3. Census and Statistics Department. (2020). Hong Kong annual digest of statistics. https://www.statistics.gov.hk/pub/B10100032020AN20B0100.pdf
4. Centre for Health Protection. (2017). Report of population health survey 2014/2015. https://www.chp.gov.hk/files/pdf/dh_phs_2014_15_full_report_eng.pdf
5. Centre for Health Protection. (2021). Statistics on vaccination programmes in the past 3 years. https://www.chp.gov.hk/en/features/102226.html