1. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Japan
2. Department of Palliative Medicine, Osaka University Graduate School of Medicine, Japan
3. Division of Palliative Care Medicine, Jichi Medical University, Japan
4. Office of Medical Education, Showa University School of Medicine, Japan
5. Department of Palliative and Supportive Care, Palliative Care Team and Seirei Hospice, Seirei Mikatahara General Hospital, Japan
6. Division of Clinical Epidemiology, National Hospital Organization Tokyo Medical Center, Tokyo, Japan
7. Department of Medical Education, Tokyo Medical University, Japan