1. Department of Psychosomatic Medicine; Kindai University Faculty of Medicine; Higashi-osaka Japan
2. Department of Palliative Nursing, Health Sciences; Tohoku University Graduate School of Medicine; Sendai Japan
3. Department of Palliative and Supportive Care; Seirei Mikatahara General Hospital; Shizuoka Hamamatsu Japan
4. Division of Biostatistics; Tohoku University Graduate School of Medicine; Miyagi Sendai Japan
5. Gratia Hospital Hospice; Osaka Japan
6. Department of Palliative Medicine; Kobe University Graduate School of Medicine; Kobe Japan
7. Department of Human Health Sciences, Graduate School of Medicine; Kyoto University; Kyoto Japan
8. Department of Palliative Medicine; Tsukuba Medical Center Hospital; Ibaraki Tsukuba Japan