1. Department of Family Medicine, College of Medicine, Chungnam National University, Daejeon, South Korea.
2. Department of Family Medicine, Dongguk University Ilsan Hospital, Goyang-si, South Korea.
3. Department of Medicine, Dongguk University Medical School, Seoul, South Korea.
4. Department of Palliative Medicine, Takeda General Hospital, Aizu Wakamatsu, Japan.
5. Department of Palliative Medicine, Tohoku University School of Medicine, Sendai, Japan.
6. Department of Statistics, Dongguk University, Seoul, South Korea.
7. Department of Family Medicine, School of Medicine, Catholic Kwandong University International St. Mary's Hospital, Incheon, South Korea.
8. Department of Hematology and Oncology, Ulsan University Hospital Ulsan University College of Medicine, Ulsan, South Korea.
9. Hospice and Palliative Care Center, Department of Family Medicine, Seobuk Hospital, Seoul Metropolitan Government, Seoul, South Korea.
10. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, South Korea.
11. Department of Internal Medicine, Bobath Hospital, Seongnam, South Korea.
12. Department of Family Medicine, Hospice and Palliative Care Center, National Health Insurance Service Ilsan Hospital, Goyang-si, South Korea.
13. Department of Family Medicine, Eunpyeong St. Mary's Hospital, The Catholic University of Korea, Seoul, South Korea.
14. Department of Family Medicine, Ilsan Paik Hospital, College of Medicine, Inje University, Goyang-si, South Korea.
15. Department of Family Medicine, College of Medicine and Hospital, National Taiwan University, Taipei, Taiwan.
16. Department of Family Medicine, Kaohsiung Medical University Hospital, and School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
17. Division of Palliative Care, Konan Medical Center, Kobe, Japan.
18. Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
19. Division of Palliative and Supportive Care, Seirei Mikatahara General Hospital, Hamamatsu, Japan.