1. Medical Corporation Teieikai Chiba Home Care Clinic, Chiba, Japan.
2. Department of Therapeutic Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
3. Department of Palliative Care, Tsukuba Medical Center, Tsukuba, Japan.
4. Department of Biostatistics, JORTC Data Center, Tokyo, Japan.
5. Department of Palliative Care, Graduate School of Medicine, Tohoku University, Sendai, Japan.
6. Division of Supportive and Palliative Care, Seirei Mikatahara General Hospital, Hamamatsu, Japan.