1. Health Insurance Review & Assessment Research Institute, Health Insurance Review & Assessment Service, Wonju-si, Republic of Korea.
2. National Hospice Center, National Cancer Control Institute, National Cancer Center, Goyang-si, Republic of Korea.
3. Division of Cancer Control & Policy, National Cancer Control Institute, National Cancer Center, Goyang-si, Republic of Korea.
4. Bureau of Healthcare Policy, Ministry of Health and Welfare, Sejong-si, Republic of Korea.
5. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.