1. Department of Family Medicine, Ilsan-Paik Hospital, Inje University, College of Medicine, Goyang, South Korea.
2. Department of Palliative Medicine, Takeda General Hospital, Aizu Wakamatsu, Japan.
3. Department of Palliative Medicine, Tohoku University School of Medicine, Sendai, Japan.
4. Department of Medicine, Dongguk University Medical School, Seoul, South Korea.
5. Department of Family Medicine, Dongguk University Ilsan Hospital, Goyang-si, South Korea.
6. Department of Family Medicine, School of Medicine, Catholic Kwandong University, International St. Mary's Hospital, Incheon, South Korea.
7. Department of Family Medicine, Chungnam National University Hospital, Daejeon, South Korea.
8. Department of Statistics, Dongguk University, Seoul, South Korea.
9. Department of Nursing, College of Healthcare Science, Far East University, Eumseong-gun, Chungcheongbuk-do, South Korea.
10. Department of Palliative Care, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
11. Department of Family Medicine, College of Medicine and Hospital, National Taiwan University, Taipei, Taiwan.
12. Department of Family Medicine, Kaohsiung Medical University Hospital, and School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
13. Division of Psychiatry, Marie Curie Palliative Care Research Department, University College London, London, United Kingdom.
14. Division of Palliative and Supportive Care, Seirei Mikatahara General Hospital, Hamamatsu, Japan.
15. Division of Palliative Care Konan Medical Center, Kobe, Japan.
16. Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.