1. World Health Organization. Tobacco use data by country: WHO; 2017 [Available from: http://apps.who.int/gho/data/node.main.65. Accessed 12 Dec 2017.
2. Statistics Korea. Birth rates and mortality rate in 2015 Daejeon, South Korea: Department of Statistics; 2016 [Available from: http://kostat.go.kr/portal/korea/kor_nw/3/index.board?bmode=read&aSeq=351603&pageNo=&rowNum=10&amSeq=&sTarget=&sTxt=. Accessed 11 April 2018.
3. Centers for Disease Control and Prevention. Health effects of cigarette smoking US: Centers for Disease Control and Prevention; 2017 [Available from: https://www.cdc.gov/tobacco/data_statistics/fact_sheets/health_effects/effects_cig_smoking/index.htm. Accessed 18 Feb 2019.
4. Barengo NC, Antikainen R, Harald K, Jousilahti P. Smoking and cancer, cardiovascular and total mortality among older adults: the Finrisk study. Prev Med Rep. 2019;14:100875.
5. Korea Center for Disease Control and Prevention. National health and nutrition survey Cheongju-si: Ministry of Health and Welfare; 2016 [cited 2017 Sep 22]. Available from: http://cdc.go.kr/CDC/intro/CdcKrIntro0201.jsp?menuIds=HOME001-MNU1154-MNU0005-MNU0011&cid=71714. Accessed 10 Feb 2017.