1. Statistics Korea. Cause of death statistics in 2019. Daejeon, Korea: Statistics Korea, 2020 (Accessed August 31, 2021, at http://kostat.go.kr/portal/eng/pressReleases/8/10/index.board).
2. Cancer Statistics in Korea: Incidence, Mortality, Survival, and Prevalence in 2018
3. Korean Statistical Information System (KOSIS). Statistical database. Daejeon, Korea: Statistics Korea, 2021 (Accessed August 31, 2021, at https://kosis.kr/eng).
4. Fritz A, Percy C, Jack A, et al. International classification of diseases for oncology. Third ed. Geneva, Switzerland: World Health Organization, 2013 (Accessed August 31, 2021, at https://apps.who.int/iris/bitstream/handle/10665/96612/9789241548496_eng.pdf).
5. National Cancer Center (NCC). Annual report of cancer statistics in Korea in 2018. Goyang-si, Korea: NCC, 2021 (Accessed August 31, 2021, at https://ncc.re.kr/cancerStatsView.ncc?bbsnum=558&searchKey=total&searchValue=&pageNum=1).