1. Division of Orthopedic Surgery, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
2. Palliative Care Team, Niigata University Medical and Dental Hospital, Niigata, Japan.
3. Department of Orthopedic Surgery, Uonuma Kikan Hospital, Niigata, Japan.
4. Division of Palliative Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.