1. Department of Radiation Oncology, National Cancer Center Hospital East, Chiba, Japan
2. Innovation Center for Supportive-Palliative and Psychosocial Care, National Cancer Center Hospital, Tokyo, Japan
3. Palliative and Supportive Care Division, Seirei Mikatahara General Hospital, Shizuoka, Japan
4. Division of Biostatistics, Tohoku University Graduate School of Medicine, Miyagi, Japan
5. Department of Palliative Medicine, University Graduate School of Medicine, Miyagi, Japan