1. Department of Psycho-Oncology and National Cancer Center Hospital, Chuo-ku, Tokyo, Japan.
2. Department of Palliative Medicine, National Cancer Center Hospital, Chuo-ku, Tokyo, Japan.
3. Department of Nursing, National Cancer Center Hospital, Chuo-ku, Tokyo, Japan.
4. Department of Pharmacy and National Cancer Center Hospital, Chuo-ku, Tokyo, Japan.
5. Department of Medical Oncology, National Cancer Center Hospital, Chuo-ku, Tokyo, Japan.