[1] The State Council. The proposal of the CPC central committee on formulating the 14th Five-year plan for economic and social development and the long-range objectives through the year 2035. 2020. http://www.gov.cn/zhengce/2020-11/03/content_5556991.htm. [2020-11-03]. (In Chinese). http://www.gov.cn/zhengce/2020-11/03/content_5556991.htm
[2] United Nations. Department of economic and social affairs population division. 2019. https://population.un.org/wpp/Publications/Files/WPP2019_Volume-II-Demographic-Profiles.pdf. [2021-9-12] .https://population.un.org/wpp/Publications/Files/WPP2019_Volume-II-Demographic-Profiles.pdf
[3] National Bureau of Statistics. The seventh national population census 2020 Brief. 2021. http://www.stats.gov.cn/tjsj/tjgb/rkpcgb/qgrkpcgb/. [2021-5-11]. (In Chinese). 
[4] United Nations. Report of the world assembly on aging. 1982. https://www.un.org/esa/socdev/ageing/documents/Resources/VIPEE-English.pdf. [2021-9-14].https://www.un.org/esa/socdev/ageing/documents/Resources/VIPEE-English.pdf
[5] United Nations. Political declaration and Madrid international plan of action on ageing. Second World Assembly of Aging. 2002. https://www.un.org/esa/socdev/documents/ageing/MIPAA/political-declaration-en.pdf. [2021-9-14].https://www.un.org/esa/socdev/documents/ageing/MIPAA/political-declaration-en.pdf
[6] Zhang YL, Zhang L, Zhang XH, Sun JJ, Wang Dm, Chen G. Fall injuries and depressive symptoms among older adults and the mediating effects of social participation — China, 2011–2018. China CDC Wkly 2021;3(40):837 − 41. http://dx.doi.org/10.46234/ccdcw2021.207CrossRef
[7] Sun JJ, Zhang YL, Zhang XH, Song XM, Chen G. Situation, challenges and countermeasures of home-based health care service supply and demand in China. China CDC Wkly 2021;3(40):847 − 53. http://dx.doi.org/10.46234/ccdcw2021.209CrossRef
[8] Zhang XH, Hu XY, Zhang YL, Sun JJ, Chen G. Longitudinal association between oral status and depressive symptom among Chinese older adults — China, 2014–2018. China CDC Wkly 2021;3(40):842 − 6. http://dx.doi.org/10.46234/ccdcw2021.208CrossRef