1 Department of Palliative Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan.
2 Department of Oncology, No.7 Medical Center of PLA General Hospital, Dongsi Shitiao, Beijing, China.
3 Medical School of Chinese PLA, Beijing, China.
4 Department of Public Health, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan.
5 Department of General Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan.
6 Department of Palliative Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan; Department of Palliative Medicine, National Cancer Center Hospital East, Chiba, Japan.
7 Department of Palliative Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan; Department of Urology, Koto Hospital, Tokyo, Japan.
8 Cancer Therapeutic Center, Juntendo University Urayasu Hospital, Chiba, Japan.
9 Department of Palliative Medicine, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan. Electronic address: akiom@juntendo.ac.jp.