1. Palliative Care Unit, National Sanyo Hospital, Yamaguchi, Japan.
2. Department of Internal Medicine, National Sanyo Hospital, Yamaguchi, Japan.
3. Second Department of Internal Medicine, Okayama University Medical School, Okayama, Japan.
4. Department of Clinical Research, National Sanyo Hospital, Yamaguchi, Japan.
5. Seirei Hospice, Seirei Mikatabara Hospital, Shizuoka, Japan.