Statistics Korean, 2022 Census of Population·Trends birth and death statistics, 2022. Available from: https://kostat.go.kr (accessed Feb. 14, 2023) C. K. Koh, C. M. Ko, H. Y. Park, “Critical Care Nurses’ Perception of Life-sustaining Treatment at End of Life: A Content Analysis” Journal of Korean Critical Care Nursing, Vol.10, No.1, pp.41-50, 2017. C. L. Sprung, B. Ricou, C. S. Hartog, P. Maia, S. D. Mentzelopoulos, M. Weiss, , . . . A. Avidan, “Changes in End-of-Life Practices in European Intensive Care Units from 1999 to 2016”, JAMA, Vol.322, pp.1692-1704, 2019. DOI: https://doi.org/10.1001/jama.2019.14608 M. J. Ko, S. H. Moon, “Factors Influencing Performance of End-of-life Care by ICU Nurses”, Journal of Korean Academy of Psychiatric and Mental Health Nursing, Vol.25, No.4, pp.327-337, 2016. DOI: https://doi.org/10.12934/jkpmhn.2016.25.4.327 National Life-Sustaining Care Agency, An Overview of the Decision-Making System for Life-Sustaining Care, Available From: https://www.lst.go.kr/decn/establish.do (accessed July. 11, 2022)