1. Faculty of Medicine, Okayama University Medical School, Okayama, Japan.
2. Department of Palliative and Supportive Care, Tsukuba, Japan.
3. Department of Therapeutic Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
4. Medical Corporation Teieikai Chiba Home Care Clinic, Chiba, Japan.
5. Division of Supportive and Palliative Care, Seirei Mikatahara General Hospital, Hamamatsu, Japan.