1. United Nations High Commissioner for Refugees. [Online] https://emergency.unhcr.org/entry/43935/older-persons
2. World Health Organization. [Online] https://www.who.int/news-room/fact-sheets/detail/10-facts-on-ageing-and-health
3. Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries;Sung;CA Cancer J Clin,2021
4. National Cancer Institute. Age and cancer risk. [Online] https://www.cancer.gov/about-cancer/causes-prevention/risk/age#:∼:text=Age%20and%20Cancer%20Risk-&text=The%20incidence%20rates%20for%20cancer,groups%2060%20years%20and-%20older.
5. Cancer incidence and mortality in china, 2016;Zheng;J Natl Cancer Cent,2022