1. Nursing Course, School of Medicine, Yokohama City University, Yokohama, Kanagawa, Japan.
2. Department of Palliative Nursing, Health Sciences, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan.
3. Palliative and Supportive Care Division, Seirei Mikatahara Hospital, Hamamatsu, Shizuoka, Japan.
4. Department of Palliative Medicine, University of Tsukuba Hospital, Ibaraki, Japan.
5. Department of Human Health Sciences, Kyoto University Graduate School of Medicine, Kyoto, Hyogo, Japan.
6. Department of Palliative Medicine, Tsukuba Medical Center Hospital, Tsukuba, Ibaragi, Japan.